Trailing Truck of Q1 4-6-4-4 #6130:
Q1 4-6-4-4 #6130 Trailing truck with booster.
The 6-wheel trailing truck of S1 and S2(Steam Turbine) :
S1's tender trucks, once exchanged with 6110's tender trucks for testing, returned after the test. ATSF 2900s 4-8-4 used the same model, probable a design from Baldwin.
Jones 3D Modeling Club https://www.youtube.com/Jones3DModelingClub
Quote feature is screwed up again; here is the three-dollar tour of the general logic behind the stabilizing rollers:
I do not have good records of online illustrations for the following, but you may want to go through the history of trailing trucks (particularly the change from 1st to 2nd-type Delta) and look a bit at the general knowledge of what '20s trailing trucks did and didn't do well.
Most of the early accommodations for trailing axles in locomotives with low fireboxes did not hinge-pivot them following the Bissel formula; about the closest would be Cartazzi axles which arranged the suspension pedestals to have just the right lateral radius that the wheeltread and flange contact patches would 'track straight' to the inside tangent involved. The chief issue here is that one important thing a trailing truck has to do is to steer the back of the locomotive chassis, and as more and more designs recognized the importance of large radiant area, circulators, heavy cast beds and ancillary machinery at the extreme rear of the locomotive, etc., designs that accomplished lateral compliance with -- well, devices like the lateral-motion devices used on driver cannon boxes, acting only as far back as the hub liners on trailing wheels, there are rapidly-achieved limits on how much stabilizing force you can apply, and the range through which that force can be made to act proportionally, which apply strictly to inside-bearing trailers and somewhat less but still meaningfully intensively to the many 'patent' outside-bearing lever arrangements involved in the pre-Delta trailing truck arrangements, many of which are known by their inventor's or promoter's names.
The Delta two-wheel truck, as perfected, solved the tracking issue with the pivot and axle location, and the equalization issue with onboard levers controlled by the relatively heavy frame structure. However, you may note that simply by extending the truck frame far back in the right way, you can arrange lateral-motion compliance between the extreme rear of the frame and the truck-frame extensions, thereby achieving as long a lever arm as really possible to exert steering force both 'on' and 'to'.
The problem being, as you will quickly notice in a model or with reference to drawings, that the swing is very long -- much longer than an undamped facing-spring arrangement can accommodate without dreadful resonance. (There is an epic story about a Reading 2-10-2 given "sprung" truck steering that was so bad even at drag speeds that someone from shop forces had to come out and weld the arrangement solid to permit getting the train the rest of the way over the road...) The initial arrangement used here took advantage of a happy characteristic of equalized engines: if you use inclined planes in the 'corners', the actual weight of the chassis can serve as the proportional restoring and centering force. It did not take long before the idea of using upside-down heart-shaped cams, or a gear-and-sector approach, cut to use rolling and not sliding tribology, was adapted to give long swing (we see pairs of heart-shaped cams also used for lateral in some Adams pin-guided lead trucks, which among other things allows separate control of small-period lateral oscillation coupling to hunting due to flange clearance or railhead wear vs. progressive curve guidance or Voyce Glaze-style steering against what would otherwise have to be handled by relatively high reciprocating overbalance.
As a peripheral note: you have probably read up on Woodard's clever articulated trailing truck ... and some of the reasons it could be a disaster in practice, particularly when you tried to back the train on a curve. An interesting thing some of these trucks shared with the earlier two-axle Delta trucks was this: the axle spacing is prescribed as part of the Bissel formula, but other considerations -- practical weight distribution to the axles and location of the ashpan arrangements being two -- often dictated a geometrically suboptimal position for the leading trailer axle. Timken devised a highly interesting arrangement that essentially treated a four-wheel trailing truck as a very long single-rear-axle Delta frame, with the forward axle completely free to 'float' laterally in its pedestals, the weight being transferred to it from the frame via a couple of large hardened lateral rollers. The guiding force for the rear of the chassis was only passed to the track through the cone and flanges of the rearmost wheelset; the forward one was essentially weight-bearing only.
"I did some googling. I haven't found anything that conclusively proves what I'm about to say, but it looks like the person being misquoted here is a guy named Darryl Anka, who claims to be channeling a "multi-dimensional extra-terrestrial being" named Bashar. Anka has a web site that I don't want to link to, but I'm sure you will find it if you search for it. I'm reluctant to link to any woo woo sites, but I think I have to post a couple of links, since they are the only evidence we have of where this quote came from. The quote started appearing on the web some time in 2001. (You can use date ranges when you search with Google). http://www.angelvalley.org/assets/pdf/bashar-ides-of-march.pdf [Broken] (titled ‘The Ides of March’, channeling from Bashar by Darryl Anka) is filled with so much nonsense that I can't make myself read it, but it came up in the search results, so I searched the document for "frequency", and found that it ends with the words This is not philosophy! This is physics! Everything is energy and that's all there is to it. Match the frequency of the reality you want and you cannot help but get that reality. It can be no other way. This is physics. This web page contains the quote Match the frequency of the reality you want and you cannot help but get that reality. It's attributed to Bashar, not to Einstein. "Reference https://www.physicsforums.com/threads/einstein-misquoted.583449/
Miningman"Everything is energy and that’s all there is to it. Match the frequency of the reality you want and you cannot help but get that reality. It can be no other way. This is not philosophy. This is physics."
Except that, oh Lord, it's not. This sounds like someone who has confused pop-Einstein with pop-Tesla with about as much actual physics knowledge as someone talking about 'detoxing' and 'cleansing' has medical knowledge.
Resonance is really useful, as are the somewhat more sophisticated versions used in control theory. Note that strange attractors (and other convergent or metastable-convergent functions using sequential probabilities) don't work at all deterministically in the happy idea that what may be true for SHM or electromagnetic radiation accurately describes even small systems of complex reality.
And then we get to what E=MC^2 is derived from, and what it means, and from there we get to quantum mechanics and what the 'numbers' that can be quantum entangled actually represent (hint: it assumes particular structure of matter, and preservation of relationships in that structure across 'distance', in ways that have nothing to do with oscillating frequency in the classical sense).
Much more fun than "frequency" per se is the ongoing discussion of the wave-particle duality in so much of this physics. Just be sure you have the aspirin bottle reasonably near when trying to conceive of what an actual 'photon' represents (and why it has a virtual wavetrain of more than one EM cycle at given wavelength/frequency contained in it...)
There is PLENTY of stuff that was that does not 'still exist'. One case in point should be highly familiar to you: where are the neptunium-series daughters??
And I ask you to consider the numbers that would have to be manipulated to produce a time-stable S1 ... as opposed to one with, say, a gold tooth in its front end, or paint patched for Conrail, or one metric-size tender wheelset. Transfinite numbers, aren't they? Suspect no amount of faith-based reasoning can help extract just the right complexity and phase in just the right area of reality to help with this -- unfortunately. If only Mary Baker Eddy's father had been able to craft a religion...
Miningman Regardless, The S1 should never have been scrapped.
Regardless, The S1 should never have been scrapped.
OvermodNote the difference between a 'main' driver's rod pin and the one on the wheelset with the lateral-motion device installed. That last picture likely does reflect the difference between main and coupled-wheel sets, the item pictured with the lateral-motion device installed and in the foreground therefore being indeed either the first or third wheelset. Suspect these are implemented with concentric 'snubbing' springs rather than any kind of friction damping (as was, I think, more general PRR practice for this stuff at the time). That might be an issue with lateral flange force at high speed, even with good lateral control on the lead truck; there is something of a geometric issue here both in spiral and continuous curve between the 'chord' between lead-truck and trailing-truck-pivot pins projected out to the tread-contact/flange-contact line vs. the actual desired tangency between tread cone, fillet, and (only in last recourse!) actual flange face as the lateral take-up occurs. Resonance here due to underdamping (or the wrong snubbing frequency ranges) might lead to some very poor effects...
ALCO made Lateral Cushioning Devices for the UP FEF-2 locomotives (820-834)
Patent Drawing from Google.
"Everything is energy and that’s all there is to it. Match the frequency of the reality you want and you cannot help but get that reality. It can be no other way. This is not philosophy. This is physics."
Falsely attributed to Albert Einstein but maybe there is hope for The S1 to be made to appear. Pop! There it is!
(This kind of makes a person's thinking to short circuit...like thinking about infinity).
However I do believe everything that was still is, just not sure how. Have some ideas but way too everything for here.
We do use matching resonance in Geophysics as an exploration tool.
Note the difference between a 'main' driver's rod pin and the one on the wheelset with the lateral-motion device installed. That last picture likely does reflect the difference between main and coupled-wheel sets, the item pictured with the lateral-motion device installed and in the foreground therefore being indeed either the first or third wheelset.
Suspect these are implemented with concentric 'snubbing' springs rather than any kind of friction damping (as was, I think, more general PRR practice for this stuff at the time). That might be an issue with lateral flange force at high speed, even with good lateral control on the lead truck; there is something of a geometric issue here both in spiral and continuous curve between the 'chord' between lead-truck and trailing-truck-pivot pins projected out to the tread-contact/flange-contact line vs. the actual desired tangency between tread cone, fillet, and (only in last recourse!) actual flange face as the lateral take-up occurs. Resonance here due to underdamping (or the wrong snubbing frequency ranges) might lead to some very poor effects...
Photo taken in 1938 in Baldwin workshop, roller bearing (?) equipped on the axle, I don't know If this was built for S1. (Source: Railroad Museum of Pennsylvania)
I tried to find out what happened outside the "Broadway" during the Dark Age of post-war America's railroad history in mid-1950s, which was only merely 10 years after PRR sent S1 to the torch. These two videos from YouTube answered me many questions I haven't even asked yet.
"GREYHOUND BUS LINES GUIDED TOUR 1957 PROMOTIONAL FILM 71122""The Golden Age of Travel | Airline Hostess | 6 Hours on Pan Am 1950's" The general public had more transportation choices, all forms of conspiracy theories aside, the Free Economy was working just fine, until......
Breitspurbahn: Ocean liner on wheels
This is really something I would spend a fortune just to experience......
___________________________________________________________
Well that is something I have not considered. Fascinating.
Also re: Breitspurbahn
Can you imagine having a conversation about Pennsys new 24,700hp
4-12-12-4 + 10-10 + 4-12-12-4. Yeesh.
The Smithsonian Channel covered this fairly well along with some animation on their series on Combat Trains. The Nazi's had over a hundred engineers working on this. They had a lot of plans, lots of locomotive designs, consists fiqured out ( I suppose that swimming pool would be a wave pool), lots of drafting blueprints and scale models but all they got done in the construction was some route surveying.
Didn't John Kneiling have some ideas along these lines as well.
You really think this could be a thing?
If steam do you haul around a lake with the locomotive. The water demand would be gigantic. A boiler mishap would take out a town.
MiningmanThere are other alternatives to a gasoline tax but I mention this as the most likely to temper down extended highway trips.
Oh, there is a much, much better theoretical alternative, one which in fact looked very likely in its earliest years. That is the construction of all modern grade-separated highways compliant with ITS (like the one GM was developing intensively in the '40s) and therefore flexibly and appropriately tolled in a way that can track any traffic pattern or combination of incentives/disincentives reliably. Naturally the minimum rates are set to recover cost of capital and aid in proper operation of the relatively complex automatic machinery ... and can be easily adjusted to keep overused or congested lanes priced to capacity. If that is the expectation for the future of multiple-lane grade-separated parkways, as it was in a lesser sense well into the Fifties, you never get to metastasizing freeways sucking the life out of cities and causing the paving over of downtowns. And more appropriately, it keeps a luxurious and convenient rail service well-enough patronized to make system improvements desirable.
The actual future that should have been starts with J.P. Morgan's railroad expert NOT dying unexpectedly in 1906, but instead leveraging much of the available power of the investment bank into PRR-like grade and capacity improvements on elements of a practical transcon -- this might involve a more successful version of the Reading Combine with a stronger Poughkeepsie Bridge, or a B&O not impoverished by the New York Extension. It is possible that the Hepburn Act wouldn't have gone through as it did had more knowledgeable people lobbied against it, not for cheap advantage but to assure good railroad profitability in depth.
This is just at the time Edison et al. made the enormous strides in practical use of structural concrete, and good-size earthmoving machinery began to appear in civil efforts. It's not difficult to imagine the grading of the Atglen and Susquehanna and the bridges/viaducts of the Lackawanna Cutoff more and more widespread across the parts of the Northeast that constituted the historical bottlenecks both to power and speed.
Now fast-forward to the Twenties, and the PRR plans for New Era reconstruction of substantial parts of some of its main lines for high speed. It is not difficult to figure out a world in which the Depression was caught relatively early as far as its effect on production and factor transportation were concerned, and in this world expansion of both electrified and unelectrified power would run hand in hand with the improvement 'curve' from 1928 on instead of being starved. That is the model for constructing true high-speed trackage from the early Thirties forward, with all the fun stuff done around the world with lightweight push-pull compatible trains finding all the use they deserved, and lightweight but much larger trains taking their place as needed.
Of course, what I've wanted to see ever since the days of 'the case for the double-track train' was the United States version of the German Breitspurbahn: actual grand-hotel style superior to almost anything possible in competition.
(Ok lets try this again ...I lost the response, cannot recover it, somewhere in the Cloud..what a frustration.It was done too! Good grief)
Yeah, Seven of Nine would have made a great spokesperson for Amtrak in the '90's. Legions of men could be lead off a cliff.
As to my theoretical proposal, and the tax angle, I think Truman was the kind of President that would just tell everyone to "suck it up". There are other alternatives to a gasoline tax but I mention this as the most likely to temper down extended highway trips. Both freight and passenger would have benefitted and the Nation as a whole just from an environmental viewpoint or carnage and mayhem. Today it would seem genius, the absolute right thing and without anyone knowing perhaps saved well over a million lives. Ike and Kennedy would have gone along with this, even solidyfying it further and then it becomes a way of life, without question.
Fares would be kept low, as well as sleepers and dining. It is for the common man, not for the wealthy. The wealthy can drive and fly. Target customers would be business folk, travelling salesman, seniors and teens. It is a social benefit of sorts and viewed as an absolute necessity and a viable option. Lets say in due time long distance trains are cut back somewhat as alternatives arrive. Maybe long distance trains become the domain of luxury cruises, not part of this system. The real markets are the intercity East, the West Coast, Texas, Florida, Middle America radiating from Chicago, and isolated areas relying on rail.
Just think a 20-25 year advance on anything running in Japan and Europe today. This would be a source of incredible pride and neccesity.
https://youtu.be/71I7Gq-_BAw
Open the above and enjoy Jeri Ryan aka Seven of Nine
The Commies have taken over
MiningmanI can see the Borg appliances all over you, a-la-Picard.
But consider the advantages -- Seven of Nine with added senses, for example...
The problem is that history is very, very clear about what voters would stand to be taxed for, especially taxed on gasoline. The quid pro quo for the original Highway Trust Fund involved the hard condition that none of the money would be diverted to 'transit' or some mode other than road-building; I in fact would be screaming at the idea of using a gas tax to pay for transit somewhere else from where I live, or as a subsidy to some private railroad so it can make a guaranteed 6% on services I don't use. (Remember this is before the period where the right kind of claims for 'publicizing' whole commuter districts and services could be made, I believe New York State being the first in about 1966, with the utter and complete understanding the stuff would never, ever come remotely near paying for itself.)
I still vividly remember the analogy that was given to me early on in the Amtrak years -- this being back when Volkswagen made a cheap economy car. Running the published numbers indicated that every passenger who rode Amtrak could have been given a Volkswagen and gas to run it a reasonable number of miles a year, at full government expense, and the finances would have come out ahead. And that's platinum mist and far-from-exceptional service on a great many route-miles. Imagine what could have been involved for Turquoise Room level services... or even for attractive cruise trains where all the operational models for food service and entertainment work efficiently.
A division is set up to advance technology and achieve great things for the future, call it a railroad version of NASA but much earlier.
Johnson's High Speed Ground Transportation initiative was just this, and more, and indeed in that 'guns and butter' era plenty of money was thrown at the "modern" alternatives ... unfortunately, all too often the mid-Sixties versions of the lightweight trains of the Fifties, or that early competitor of mag-lev for the scientifiction aficionados, the hovertrain. Again, the idea of a Democratic Party-sponsored system of subsidy of things perceived as, or that could be 'spun' as, rich-folks luxury, with so many programs of the Great Society competing for available funds, is not something I'd wager confidently on.
Also bears noting that this was the era where the 'next step' after the 707 and similar 'jet set' transportation was going to be the practical supersonic transport, which really should have been built to XB-70 technology and not Concorde kludging. And where the world actually went instead was to the Freddy Laker model, where you go New York to the West Coast in about 6 hours for $135 and so fill every seat on colossal aircraft with enormous potential equipment utilization. (Take a look at the flown mileage of the Braniff 'Big Orange' 747 and tell me how anything ever designed or built for Amtrak could compete.)
Overmod-- Oh my. I can see the Borg appliances all over you, a-la-Picard. Even the directed laser beam comes straight thru my screen.
I shall do my best to fight back against assimilation, resistance can be expected.
Lets assume the people at the top are learned folks, a bit more attuned to the future than your average bear. A special meeting is called perhaps even attended by the POTUS and the Railroad CEO's from across the land, to address the alarming trend in passenger train ridership. Since these are concerned leaders and have superb information lets set the date as 1950. Perhaps in the very room the famous Godfather scene was filmed, in Grand Central with the Empire State Express painting on the wall. That part dosent matter, just to add a touch of seriousness to the discussion. UP, Sante Fe, C&NW, Milw, NYC, Pennsy, B&O, GM&O, Monon, Soo Line et al, they are all there. Hundreds of millions have been spent on re-equipping new streamliners. Sleepers and diners are new and plentiful. Service standards are high. Their track is plentiful, dedicated and in tip top shape with knife edge ballast. Even on the Rock Island! War time profits have been correctly used for this. However the trend is undeniable, ridership is dropping off alarmingly, and it is in the nations interest to maintain a strong viable and leadership role in passenger services for the long term and into the future.
I see Truman as a man who will make hard decisions in the Nations interest. I see Ike as a President who has a skeptical eye on what he famously referred to later as the military industrial complex. The Nations interest in this is paramount to him as well, Madison Ave, GM, GoodYear, even the Railroads themselves be damned. He is sympathic and correctly so, as is Truman, to make sure this passenger service is kept alive and well and the investment not be lost. Lets say the rest of it unfolds just as it did. The highway systems, the airports, the St. Lawrence Seaway, all of that. However just before that happens the government takes over all passenger track, the equipment, the stations, the employees in passenger services. The Railroads supply the engineers, for now anyway, and are held to account that passenger trains receive top priority in track superiority where required. Local and State taxes are waived in the Nations interest and due to Federal Ownership, period, over and out. A giant burden is taken away from the railroads, no payment to the railroads involved, tax relief is guaranteed. Maintenance costs are greatly reduced. They must still pay for the upkeep of their own freight tracks, but anything to do with passenger is now cost free. There is a lot of quid pro quo in these negotiations and the details involved but there was a common sense and understanding of the spirit of things back then that perhaps does not exist today.
So yes a cost to the Government. No mandates to make a profit, but a well oiled, robust and modern passenger service is kept intact. A division is set up to advance technology and achieve great things for the future, call it a railroad version of NASA but much earlier. Paid for by the way of a special gasoline tax, which of course also pays for the passenger trains shortfalls. Fares are inexpensive, ditto sleepers and meals. This assures less highway intercity travel and long distance trips. Perhaps North America would have developed incredible and unforseen 'we can only imagine' trains which point the way to responsibility of family and environment, pride, a less frantic and insane society, smarter people and cooler heads.
Another could be a direct guaranttee of $$'s at say a 6% return on all passenger services, covering any and all shortfalls from stations to track work, again paid for thru a gasoline and airport tax. This will insure high levels of service and an incentive not to discontinue trains. It will keep many cars off the highways, but still fine for suburban going to work or the grocery store use but if you are going to visit Aunt Petunia in Moose Jaw, then its a no brainer, one takes the train and the train is available.
Essentially this is what happened but in the exact reverse!
If you showed that picture that Jones1945 put up in his last post, of E8 4312 all beat up with its sad consist, to the CEO's and the POTUS in 1950 they would be horrified and maybe think, and who could fault them, that the Communists took us over. But the guy from GM would be smiling, not only did they destroy the passenger train with a wink and nod from government they got to feed them the poison.
You know it reminds me of your current President who before his inauguration was discussing the costs of the new Air Force One and said "we want Boeing to make money, but not that much money".
MiningmanWe had it and we had it all and a lot of it was new and state of the art.
And the fact that so much of it was gone in two decades, almost across the board, with only the exceptional hanging on, will tell you all that is really needed about the economics. It would be nice to have a 'flagship' level of service on a meaningful national network, or a reasonable American equivalent to the original ICE or Trans-Europ-Express services. But absent a motivated government with the political will and community organizing needed to perpetually throw down thousands of revenue dollars per passenger to provide services for the relatively few at a level inherently targeted to the relatively wealthy ... and that is NOT something American democracy has reasonably provided in most postwar years ... you really can't expect, say, any railroad in the Northeast to pay for that stuff itself.
[quote]In the East there were many places, the important ones, where the trackage was 4 mains, 2 dedicated for passenger, one EB and one WB. Quite a lot of other trackage was 2 mains. It is only now that double tracking is becoming a thing again. The passenger service and its trackage should not have been lost in the first place.[quote]
Of course, this begs something of a question: the safety of typical double-track mains with close spacing and deferred maintenance. Slowing down for all passing traffic is not an unreasonable action, but much of the supposed utility of the separated tracks goes away as it becomes progressively unsafer to traverse them with a closing speed well over a fifth the speed of sound.
And then we come to the BIG thing that was never really very well solved, the issue with local taxation of all that ROW needed for the multiple tracks and other plant. It's easy to snicker at New Haven selling all its stations and then leasing them back, but it takes down an otherwise high-and-trending-higher tendency for locals to skin the perceived octopus because they could. Worse yet, under the Fifteenth Amendment it becomes difficult to impossible for the Federal government to override local and State taxation with a commerce-clause excuse, although there are times when that might have been achievable (right after the Heart of Atlanta decision, for example).
You may also note that one very early thing NYC did was replace an obsolescent four-track main with CTC, reducing an enormous amount of various kinds of cost and liability in the process. Could the other two tracks have been removed if the passenger traffic had remained at classic Great Steel Fleet levels ... albeit operated a bit slower at some times and route segments? Or could CTC over three or four tracks in places provided still more effective fluidity? We won't know, because two-track CTC was perfectly adequate for what NYC ever needed by the time it was operational.
There were several effective ways to prevent this loss and preserve passenger service to a very high standard. (That could be discussed later.) Getting there faster means nothing.
They do need to be discussed, and 'getting there faster' certainly does mean a great deal ... when it is appropriate (as in many corridor services, even today). One of the enormous expenses on LD trains is the necessity of a great many operating trainsets, with all the personnel involved, in order to have even rudimentarily convenient services. "Sailing days" are cute, but let's consider how many big passenger ships are still actively used, let alone fully subsidized, for long-distance point-to-point travel. The only practical way to provide 'daily' service over LD routes is to provide reasonably advanced speed over as much of a prospective route as possible; the economics work much as they do for aircraft. The thought of a California Zephyr built at full price and run as it was, as a cruise train going 45mph all night to let the pax sleep in their costly beds, with all the associated issues in finding and qualifying attendants with the right attitude and aptitudes, reworking the commissary and dining-car kitchen systems, etc. etc. etc. for all the required trainsets on all the required routes, is vaguely terrifying, even if you sweeten the pot with automobile-ferry service (backed up with free or discounted rentals at both ends if the ferried cars aren't promptly available).
Now, I was hoping that the idea that B&O had with Speedliner trains and Reading had with its Wall Streeter service, the idea of fast motor trains with reasonably full amenities for daylight operations, would catch on for the higher level of service and amenities we're expecting here. That wasn't the premise of those ridiculous stripper lightweight fad trains, but note what happened, and why, when some of the idea was tried on the Las Vegas Aerotrain experiment.
It would have been interesting to see what SPV consists for comparable service level (perhaps with 125mph dash capability) might have provided. Heaven knows the bugs that killed that platform were easy enough to solve. Of course you'd have to solve the showstopping issue with the unions and gearing the outer axles... something that was sure not going to happen in the '70s, and perhaps wouldn't happen even now. And at any rate the world has moved on from there technologically, and almost anything even remotely workable has priced itself out of contention for anything but spendthrift and politically distorted regional or local government-backed entities ... I do not notice special concierge service being something in the Florida or Texas private development operations.
Overmod......in fact the power needed may go up dramatically at higher and higher incremental speed ranges, certainly at the point where streamlining becomes functional rather than a marketing device. The point of shortening cutoff at higher speed is not related to 'decreasing horsepower' ......
Overmod To my knowledge, there are no objective tests sustaining a "7200dbhp" figure, and I suspect you would encounter impractical amounts of high-speed slip long before the locomotive would deliver that power through 'two sets of four' in real-world conditions. (You can run the Davis formula for a train operated at the 'design conditions', 1000 trailing tons at 100mph with whatever adjustment for track, streamlining, etc, you care to make to get a kind of Bekenstein bound on what the required horsepower at 100mph would have to be; that's a useful exercise 'for the reader'...)
Overmod Note that the Q2 was tested on the stationary plant, and given a figure in testing of just shy of 8000hp, although I don't know offhand if the S1 was tested at the time that figure was determined.
Overmod There were several spirited discussions involving the 'follow-on' design for the "T2" (code-named '5551') and one of these specifically involved using the S1's equal-length main rods in conjunction with Deem-style conjugation and cheek-plate traction control to eliminate the long frail piston rod on the forward engine.
Overmod Not unless you are Lima and fudging numbers, perhaps for management's advantage, on the only railroad built to tolerate truly extravagant axle loading at the time. (It remains to be considered how strong the VGN trackage was for their versions). On PRR the civil division probably always had enough 'clout' to keep the motive-power department strictly honest on its axle loads, both static and dynamic, in the years such an issue would be of concern.
Overmod ……There is no need for huge investments in New York and Chicago Air Line-style grade- and curve-limited construction or true HSR speeds that are fully sleeper-compatible for any of this traffic, or more southern destinations like St. Louis…….
Overmod …..and to this day you will find people who confidently state the T1 couldn't operate routinely east of the entrance to Pittsburgh station without intolerable derailing/slipping/insert ignorant canard of choice.
Overmod ……you never see the F7s running faster than the low 100s in service, but you do see some fairly spectacular evidence of running-gear failure that for the longest time was covered up in the fan-press coverage of the locomotives. And you see the F7s being taken out of service very early in the game and scrapped suspiciously fast with little attempt to preserve one, even though the replacement dieselization was haphazard at best, as bad or even worse than what happened on PRR.
Overmod In perspective, it is almost impossible that either Q2s or T1s would survive in any service meaningful to them even as late as NYC was operating Niagaras. That means no later than 1956, TrucTrains or no. Those additional couple of years don't change much, if anything, about nostalgia or 'alternative-history' claims for longer working lives for those two classes of locomotive.
From Balt:
The good smells from the kitchen as you walked the narrow passageway past the kitchen. The B&O's 'Great Big Salad Bowl' to serve your own salad portion. The complimentary demitasse coffee. The after meal finger bowls. The Deer Park water decanters on the tables (B&O owned Deer Park spring and sold it after Amtrak). Customers writing out their orders - waiters were not permitted to take verbal orders. The Steward locking and unlocking the 'bar' of miniture whiskey bottles as the train entered and left West Virginia (dry at the time). The B&O Blue china. Many of the dishes prepared in the diner were old family recepies.
From gmpullman:
BandO_4-24-66_service by Edmund, on Flickr
From me:
...This is all gone because why? Yeah yeah Ive heard it all before, it's empty meaningless tautology and self fulfilling stupid stuff.
If, If this was a thing today it would require multiple sections.
The joys of airports and the easy going crusin' on the highways. A bag of potato chips and fast food crap.
We are the Borg. You will be assimilated. Resistance is futile.
Thats quite a detailed and informative response Overmod.
The above and following goes to your response in the letter preceding your last one.
We had it and we had it all and a lot of it was new and state of the art. In the East there were many places, the important ones, where the trackage was 4 mains, 2 dedicated for passenger, one EB and one WB. Quite a lot of other trackage was 2 mains. It is only now that double tracking is becoming a thing again.
The passenger service and its trackage should not have been lost in the first place. There were several effective ways to prevent this loss and preserve passenger service to a very high standard. (That could be discussed later.) Getting there faster means nothing.
Trains knew this when they had their "Who Shot the Passenger Train" issue.
This would have simply been a part of accepted society today.
Flying out of airports and driving on highways are approaching unacceptable levels. It is terrifying. There is a future yet for passenger trains perhaps out of sheer necessity but the cost of replacing all that track and 200 million opinions will be astronomical.
C1a's on the CASO eh? Good place for them. The T1's and Q2's as well, if they could be had for a good bargain. A dedicated fleet like that, an island unto itself, based out of St. Thomas. With its steam infrastructure very intact, some of it even new, (track pans and such), could have lasted easily into 1960 and even well beyond that. Keep it Windsor-Ft. Erie/Niagara, Canadian side only, with Diesels awaiting on each end to go stateside. That would have been quite the show.
Jones1945As we know the higher the speed of a train consist, the lesser power the engine need to tow that consist, thus at higher speed, steam locomotive use lower cutoff.
No, that ain't so; in fact the power needed may go up dramatically at higher and higher incremental speed ranges, certainly at the point where streamlining becomes functional rather than a marketing device. The point of shortening cutoff at higher speed is not related to 'decreasing horsepower' -- you have, I think, forgotten that cyclic rpm as a component of horsepower means that you are inducing greater horsepower at speed even though the torque per stroke is declining and perhaps becoming peakier with speed, and (as you could have mentioned) the effect of things like compression and back-pressure are increasingly 'impacting' the power from any given complete stroke.
Part of the actual effect you're discussing is that a good modern steam locomotive (and the S1 as an almost cartoon exaggeration provided some of the greatest exaggeration of all in this respect) carries a large vanity cushion of available cylinder horsepower in the overcritical water in its boiler, and can produce relatively more power per cubic inch of cylinder displacement than any engine which has to combust fuel completely inside its cylinders under the same conditions. At the same time, a typical diesel-electric is suffering from the range of problems relating to its transmission -- most important, the effects of back EMF in DC traction motors, part of the reason any discussion of high-speed transition does not end with 'parallel' but then involves field 'shunt'. (And the associated vastly exaggerated armature currents that become necessary, and comments about 'streetcar motors' on Raton Pass, and so forth...) So the horsepower output of a diesel electric, where the engine is constant output at a given governor setting, can be described by a rectangular hyperbola but never exceed that bound, whereas a big steam locomotive can produce dramatically higher short-term output and, if designed for it, have the ability to use 'reserve' both to achieve faster acceleration and to run a train to higher speed.
Interestingly enough, with most of the designs I'm familiar with, including the Duke of Gloucester, the shortness of cutoff matters much less in reaching high speed. Mallard is highly representative, with about 40% cutoff producing the record speed; I believe the calculations for the T1 so far indicate slightly greater efficiency through the poppet valves and streamlined steam tracting, but the equivalent is still around 36%. One of the keys for high-speed running is to plan the events around the mass flow involved with that cutoff at the rotational speed corresponding to the 'top speed' you want to sustain.
Diesels, on the other hand, need more and more against the rising train resistance (you can get this to a reasonable first approximation from the Davis formula, if you don't have a dynamometer or strain gage to measure DB resistance directly). There are figures in Brashear's book on Santa Fe power that indicate the actual drawbar pull of early ATSF diesels had fallen below 9000lb by 110mph or so (and declining more than monotonically by that point!) and this, more than just a numerical horsepower number, gives you an idea about just how such power will both accelerate and sustain a train of given characteristics.
To my knowledge, there are no objective tests sustaining a "7200dbhp" figure, and I suspect you would encounter impractical amounts of high-speed slip long before the locomotive would deliver that power through 'two sets of four' in real-world conditions. (You can run the Davis formula for a train operated at the 'design conditions', 1000 trailing tons at 100mph with whatever adjustment for track, streamlining, etc, you care to make to get a kind of Bekenstein bound on what the required horsepower at 100mph would have to be; that's a useful exercise 'for the reader'...)
The prototype of T1 #6110 “tested on the Stationary Test Plant in Altoona, developed 6,550 hp (4,880 kW) in the cylinders at 85 mph (137 km/h)” (quote from wiki)
You're better off, probably far better off, to actually review the records of the rather extensive testing to see what horsepower was recorded under what conditions. Joe Burgard had an extensive analysis and discussion of this on the T1 Trust internal forum and I believe he has posted some of those results in threads here (probably several years ago by now); I believe at least some of the test records are available on the Web (or from libraries and collections in Pennsylvania). There is little doubt in my mind that 6400hp for a good T1, and perhaps for a C1a at its 'best' speed range, is achievable, provided you can accommodate the water rate, and water-treatment conditions, that correspond to that power.
Note that the Q2 was tested on the stationary plant, and given a figure in testing of just shy of 8000hp, although I don't know offhand if the S1 was tested at the time that figure was determined. One note about the Q2 is that it was very sensitive to what I believe to be phase effect on the plant; there was so severe a difference between phase and antiphase torque that the locomotive actually surged on the rollers to the point of alarming the test crew. (It is possible that a similar effect would have been observed on the S1 at its 'peak' output, but probably acting to limit achievable wheelrim torque as the adhesion between driver tyre and roller will be less than that between tyre and railhead.)
IIRC many powerful steam locomotives developed [their] maximum DBHP at much lower speed, take UP “Big Boy” 4-8-8-4 as an example; its firebox, boiler and total heating area were slightly bigger than S1, but It only developed 6,345 DBHP at 41.5mph.
Not a fair example, as the locomotives had large nominal GA and firebox/chamber volume to accommodate subbituminous firing -- much of which actually mimicked the characteristics of brown-coal dust firing as far as primary vs. secondary-air contribution and caloric value per ton of fuel were concerned. Some of these characteristics should have been much better determined and calculated in the discussions of this class, as there is much more prompt heat release but limited actual heat content per ton (see the papers on the Victorian Railways experimentation with StuG pulverized firing for some relevant details plainly stated).
All these things make the figures of S1’s 7200 DBHP sound suspicious to me.
It doesn't really matter. The take-home message, looking at the design as a whole, was that nothing like 7200dbhp could actually be reliably derived from the locomotive in service, and it would be unsurprising if, loading the locomotive as though that were an expectation, failures in service were frequently observed.
There were several spirited discussions involving the 'follow-on' design for the "T2" (code-named '5551') and one of these specifically involved using the S1's equal-length main rods in conjunction with Deem-style conjugation and cheek-plate traction control to eliminate the long frail piston rod on the forward engine. It is interesting to consider exactly how a well-considered 4-4-4-4 can be made better than any 4-8-4 for sustained high speed; there is little doubt that for a given lightweight-rod technology the speed as well as relative durability against lateral failure is much better for the former, as is much of the cross-balance issues producing lateral 'hammer blow.' Keep in mind that the surge component of reciprocating overbalance is solved by the Langer device (Westinghouse patent, 1947) which is driven by the same gearing that would be used to drive RC valve gear without the balance issues of external return cranks.
Overmod .....I think, inherently, the way the S1 put so much of its overall weight on the lead and trailing trucks, without any kind of adjustable equalizing or unloading mechanism to put more weight on drivers for, say, starting, had already crippled its ability to run at any practical FA.
There may be some documentation on this, but I've always just assumed that the designers figured out what tolerable axle load they could put on the four driver pairs, then just jiggered the equalizing and springing to produce that effect on the scale. As with Glaze balancing on the J class, you want to divorce as much of the guiding force from the drivers as possible and produce relatively stiff lateral compliance (the exception being the lateral-motion device on the lead driver pair of the forward engine, which still does some of the 'steering' of the chassis, but much less than on a regular 4-8-4, that being accomplished by much stronger progressive lateral spring force on the lead-truck pivot arrangement and load imposed on the equalizing and roll-loading arrangements to give lateral restoring force. Under such conditions on a locomotive as long and heavy as the S1 you then arrange the drivers to be 'bouncing' as little as possible at nominal FA for whatever degree of augment your overbalance provides; we know from Kiefer that if the 'critical speed' on stiff track is over 161mph, it will almost certainly be higher for higher drivers and lighter rods and valve drive, and anything short of actual bouncing off the railhead won't produce extreme hammering of the track (it's SHM up to that point) ... the question that 'should have been asked' at that point being what the antiphase lifting of the driver pairs at that point would be doing to practical adhesion at the limit...
Just curious, I understand the differences of trucks design between T1 and S1, was it possible to use softer suspension springs at both 6-wheel leading and trailing truck?
Be very sure you appreciate the design of those trucks on the T1, both in the implementation of the lead truck (which was carried over almost unchanged into the C1a design) and the placement and configuration of that somewhat-ridiculous-looking trailing truck with the axles seemingly too close together and not very well centered under the rear of the locomotive.
Those trucks on S1 had independent suspension consisting of coil and leaf springs, PRR could adjust them one by one independently according to their needs.
This is one of those timeless topics on the Yahoo group 'steam_tech' with proponents of full equalization duking it out with the (largely British) contingent who think proper permanent way makes any kind of lever equalization nugatory at best. I am resolutely in the former category, and would expect any high-speed truck to feature equalization "inside" somewhere, even if the individual axleboxes have separate visible springs fore and aft; the situation is somewhat different from modern diesel trucks like the GE 'rollerblades' that have floating axleboxes located and laterally controlled by spring distortion, and it might be interesting to see whether the Fabreeka approach (composite shear spring) as seen in practical Centipede tenders (and in some interesting testing on N&W trucks) would represent a better approach.
On the other hand, the six-wheel trucks were unnecessary as early as 1947 in the Westinghouse follow-ups to the direct-drive mechanical turbine (the locomotive being drawn in one catalog explicitly as a 4-8-4) and they made any locomotive relatively longer than it 'had to be' (which became increasingly relevant as tenders capable of accommodating the necessary treated water for modern boiler system life even for 130-mile-long divisions ballooned in size). It may be demonstrated that no practical circulation construction for fireboxes/chambers much larger than the T1's GA (92') could be made to run over a two-axle truck with proper steering and guiding geometry ... but the C1a certainly expected to run at over 6000hp, and the tender for it was calculated (at 64t) to produce Harmon-to-Chicago runs without refueling, something that would likely be good for at least 15min schedule reductions on Water Level Route trains (it would have been interesting, in an extremely good way, to see what C1as would have done on the CASO). But of course this is with the obligate use of frequent track pans, and the effects on proper water-treatment dosing that go with that (particularly including oxygenation of the feedwater in the tender cistern)
Keep in mind that the C1a was explicitly meant to have almost an identical "Niagara" boiler (with the added length to line up on the slightly longer chassis) but its number sequence indicated Kiefer fully expected 6400hp from the duplex vs. 6000 from the comparable 4-8-4. This may be analogous to the expectation of over 8000hp from the V1 turbine with a nearly-identical Q2 style boiler.
By the way, if more weight was put on the drivers, would it excess the axle load regulation?
Not unless you are Lima and fudging numbers, perhaps for management's advantage, on the only railroad built to tolerate truly extravagant axle loading at the time. (It remains to be considered how strong the VGN trackage was for their versions). On PRR the civil division probably always had enough 'clout' to keep the motive-power department strictly honest on its axle loads, both static and dynamic, in the years such an issue would be of concern.
And meanwhile, there was that huge investment in T1s, weighing down the books just at the time PRR needed 'better' power but impossible to peddle elsewhere...
Something to quietly remember is that even after all the design issues were solved in theory (by 1948) PRR couldn't find anyone who would buy them ... at what the equipment trust would allow them to be sold for.
It might be interesting to see if there is any surviving correspondence about PRR offering to 'subsidize' some of the necessary purchases. I can see some of that being tried, and the 'hatchet job' starting only when that approach had failed...
I once thought that building some HSR which linked most of the tier one cities in North East in 40s was the only way to compete with Airline or Greyhound.
It was actually much simpler than that, and I think NYC and PRR were both well aware of where to put the marginal improvements needed to make the ride better for the sleepers and the trip time a couple of hours quicker. Remember that then, as really now, the practical 'trip time' has to be no faster than what elapses between a couple of reasonable hours after the close of business in one city to reasonably-assurable early-morning arrival before business in the other -- this being probably no better than 12 to 13 hours elapsed time, even with unfavorable time change going eastward. There is no need for huge investments in New York and Chicago Air Line-style grade- and curve-limited construction or true HSR speeds that are fully sleeper-compatible for any of this traffic, or more southern destinations like St. Louis.
What it does presume, of course, is (1) that the Middle Division is fully electrified, as per the 1943 engine plan, and (2) that the tunnel under Horse Shoe, and the associated line straightening, is carried through. That turned out to be something PRR found 'more expensive' for value received than dieselizing, and while we can argue with it for romantic reasons it is depressingly hard to fully justify it at the time.
PRR or NYCRR had the best tool like T1 and Niagara but the coverage of their racetrack were not large enough.
With the problem being that much of the work 'necessary' to provide more route-miles of full high speed being just that much better when (1) electrified themselves, or (2) run with higher-speed diesels at lower effective long-term cost. Remember that NYC was, in 1947 at least, seriously considering long-range electrification of at least part of the route, but was perfectly satisfied just a few years later, with EMD Dieseliners and implementation of CTC. It might be quickly said that the whole case for electrification disappeared with the Great Steel Fleet.
There was little point in fixing the issue in the Pittsburgh station plant that kept the S1 from running further east. There would be little point in running that locomotive over Horse Shoe in the first place; a complete abuse of most of the 'optimizations' of its architecture. Interestingly, "railfans" conflated the hard restriction for the S1 with the temporary restriction (I think fixed not later than 1947) for the T1s, and to this day you will find people who confidently state the T1 couldn't operate routinely east of the entrance to Pittsburgh station without intolerable derailing/slipping/insert ignorant canard of choice.
But if even Milwaukee Road Hiawatha also had the same decline, I think it was not only about speed but a trend which was irreversible.
I am going to step out on a bit of a plank here, as I am almost as paranoid about F7s on Milwaukee as T1s, but in the opposite direction.
Remember that one of the great quandaries of steam design is the utter disconnect between the lie-down-and-beg dog performance of the C&NW E-4s on actual AAR testing (couldn't get even to 100mph with the test trains) and the almost identical F7s, which supposedly reached the speeds attributed to the A-class Atlantics (120mph or better) with ease. The Christian-Scientist-with-appendicitis issue is that when you look around you never see the F7s running faster than the low 100s in service, but you do see some fairly spectacular evidence of running-gear failure that for the longest time was covered up in the fan-press coverage of the locomotives. And you see the F7s being taken out of service very early in the game and scrapped suspiciously fast with little attempt to preserve one, even though the replacement dieselization was haphazard at best, as bad or even worse than what happened on PRR.
Now, let me hasten to say that I sure hope I am dramatically wrong. And that we can find someone (or the necessary group of someones) to set up a Hiawatha Trust and build replica A and F7 locomotives that can substantiate how dramatically wrong I am. But I think this is of a piece with the ATSF 3460 class, which had little trouble reaching 100mph but needed a falling grade with a tailwind to get much above 104mph. There are much better overall solutions for 110+mph speed, which the A class was clearly capable of and so were any of the ATSF 4-8-4s from 3765 onward. Be interesting to see what a Niagara-size 4-8-4 built to MILW standards would have been able to do...
I don’t know why PRR given up to raise the speed of their freight services after WWII. from Q1 to Q2, they were designed for express freight service, work best at speed.
Remember that the Q1 was intended, at an earlier era of understanding, to be a practical capacity increment over the M1 just as the C&O 2-10-4s were an increment over a Berk. As things turned out ... but, really, after 1945 ... the much better solution was lightweight rods and good valve gear and no duplexing overhead, if all you want is an M1-plus.
The Q2s were vastly more than that, and the 'smoking gun' as to what would become of them is really nowhere better seen than in the cancellation of the greenlighted-for-construction-during-WPB-times V1 prototype. The nominal advantage was supposedly the sustained running at high speed, but a practical water rate no better than typical division length just eliminated any real advantage either of the speed or of the high horsepower. On top of which were the much more finicky care and feeding of a high-alloy boiler pressed to higher-than-what-turned-out-to-be-practical pressure, and all the happy throng of maintenance and service problems, including the cockamamie antislip system as built. One trembles, just as for Centipedes, to contemplate brakeshoe changes on a V1, probably a less-than-uncommon maintenance task if the engines were used anywhere near the speed or service they would be optimized for.
If PRR thought it was dangerous or impractical, why they designed and built them in the first place?
This is not fair to PRR. When the T1 production was under consideration, the 'alternative' diesel was something like an E6, and there are perfectly good reasons why PRR didn't buy those instead of planning for T1s ... I believe the over $400K that would have been involved at the time, in gold dollars, to give equivalent horsepower at speed being one of the more compelling arguments. Likewise, when the Q2s were developed and built, it was wartime (in the years when it was still very much thought it would take a million-man invasion with, perhaps, a million or more American casualties to take out the vicious Japanese) and, not only couldn't PRR get road diesels in needed quantities, in fact not at all, thanks to the WPB, they were still looking to a future that was not based on peacetime economization.
A somewhat better irony is that, if modern steam on PRR had remained in management favor (and not stored 'unserviceable' to where the boilers were ruined in less than a year) there might have been some openings for Q2s on TrucTrain service, where they would arguably be better-suited even than the Nickel Plate Berks were in their peculiarly steam-friendly service. I think the outcome by then would not have been different (the issues with continuous blowdown under effective water treatment and with the snowballing nonavailability of all those proprietary little auxiliaries that were essential to the economics of big modern steam power being enough, even absent considerations of support and training, to wipe out any advantage of Q2s or even J1as for anything long-term or essential). It might be remembered, though, that by the time TrucTrain service came to be an important potential service there were plenty of modern E units being freed up, and even then PRR didn't spend the money to put effective backward transition on them in freight service (at least as far as I know).
I heard from pervious post by our forum members that you have some evidences of PRR officials who wanted to make T1 a hopeless engine, do you mind telling us a little bit more detail about it? To be honest, I won’t be surprise if it was the truth!
I need to be careful, like any paranoid, to point out that I do not have any hard evidence that the conspiracy to kill off the equipment-trust expense was real. There may be documents that substantiate things better somewhere at the Hagley, or in Lewistown. All I do know is that there was a hell of a lot of storytelling going on about how bad the duplexes were, all in the direction of showing how utterly mistaken the whole idea was, much of it being from people who really, really ought to have known better or at least do better homework or fact checking. To this day I keep having to correct people, in boring MEGO detail, almost chapter and verse about how to 'do' duplexes correctly, and what are the likely 'real' problems vs. the lies and wives' tales. Who knows to what actual success?
Just like many flagship corporations, they are always surround by leeches; their business partners, their own employees, government officials, bankers etc., milking the host and keep it alive at the same time, so that they can milk it even more and longer.
Again, you need to remember the situation here is exactly the opposite. PRR was on the hook to important New York bankers for a colossal sum of money, and it takes a heap of carefully-planned convincing to make those sharp-eyed characters write off an amount of that magnitude. In particular, you will be unlikely to achieve this result if you have engineers affirming how simple some of the fixes will be (centrifugally-cast valve spools being one particularly memorable one) or you have anyone even remotely highly placed in the evolving motive-power structure who spills the beans or blows a whistle trying to polish the sow's ear as much as possible when the whole world was going to silk purses, as it were.
In perspective, it is almost impossible that either Q2s or T1s would survive in any service meaningful to them even as late as NYC was operating Niagaras. That means no later than 1956, TrucTrains or no. Those additional couple of years don't change much, if anything, about nostalgia or 'alternative-history' claims for longer working lives for those two classes of locomotive.
MiningmanThe fix was to set society on a new path to an entirely new society, where the marvels of massive industrial production and capitalism, through sanctioned blatant consumerism could save the day. GM was one of the major leaders in this role, but really it was everyone, from Admiral TV's to Maidenform bras to Levittowns.
I think this was perceived, and 'spun,' very differently back in the day, and with much different intent.
I doubt if many workers from the Depression era would be complaining about job availability based on an evolving 'consumer products' market. This did, however, factor into the single biggest thing supporting Dieselization -- willingness to work hard hours in a dirty environment with only gradual advancement at tiny pay (and under lousy conditions) was not just dying out as a profession, it was disappearing completely. This affecting not only the maintenance of the locomotives, but obtaining reliable fuel for them.
Meanwhile, the whole expansion of suburban development into relatively low-income tracts (as opposed to the Mr. Blandings Builds His Dream House in Connecticut model) and everything that implied in terms of roads, cars, and general unsuitability of light mass transit and unfinancial sense of heavy rail run only a few hours a day was perceived as opportunity and progress, and compared to a decade ago it most surely was. The history of steam power in the late '40s needs to be overlaid with the history of All Those Streamlined Trains railroads sanguinely constructed, at huge expense, that almost never succeeded to the extent prewar experience indicated.
It could be argued that the Insolent Chariots model of "wealth creation" through accelerated depreciation and planned product obsolescence coupled with the social engineering of 'buying a new car every year' and climbing the social ladder from Chevrolet to Cadillac created far more than any mass-transit-intensive alternative possibly could have -- even with government support of what the large electric-generation companies would have had to take up. What is not quite as clear is the tendency for cars to become sensible competition for those streamlined trains, which involves quite a bit of infrastructure as well as vehicle engineering; if you look at the experience of the New Haven with the Connecticut Turnpike as an edged example, you realize that the Interstate system was not the major impetus away from luxury trains that a simple analysis might indicate.
A bit of an illustration: in early 1969, my father dropped me off at Penn Station to ride one of the early Metroliners. This put him on local streets with what was at the time no real direct connection to highways leading to the New Jersey Turnpike; the train departed NYP not very much later than that and ran above 100mph much of the way. You can imagine my dismay when he met the train on the platform at Union Station, having driven out to Silver Spring and picked up some people on the way. (And then there was the famous billboard, location carefully chosen in the depths of rust-belt industrial Philadelphia, the only brightly-lit colorful item for miles, cheerfully reminding 'You'd be there by now on the Air Shuttle'...)
The real defense, perhaps the only one outside well-defined lanes in well-defined corridors with wretched highways, was the idea of the Auto Train and services like it, like the stillborn CP idea to bridge tractors together with road trains. I still admire a company doing this with private money, in the '70s, and there is another cautionary tale, too, in what happened to them. But I think there was little organized effort to kill them off, just -- as in the fall of steam in the late '40s and early '50s, too many advantages synergistically applicable to competing ideas for the plan as a whole to succeed robustly or long-term.
MiningmanAlso I think people were traumatized by the war, wether they served or not. I believe just about the whole of society was going through a PTSD type of mental condition at some level. This was recognized by learned folks, maybe not as PTSD, but a general discomfort and disorder. People were not thinking quite straight. The fix was to set society on a new path to an entirely new society, where the marvels of massive industrial production and capitalism, through sanctioned blatant consumerism could save the day. GM was one of the major leaders in this role, but really it was everyone, from Admiral TV's to Maidenform bras to Levittowns.
Interesting perspective, Miningman. People were not only traumatized by the World War II itself, many things happened just after the war prolonged the anxiety of the whole society including officials in the government. Remember” Roswell UFO incident 1947”, “1952 Washington, D.C. UFO incident”, the establishment of NASA in 1958 etc. I don’t want to go too far since it will lead the discussion to something unrelated to the topic of the post or some forum member would call me out for trying to write a Science fiction here. I believe all these things happened after the war leaded the US government in late 40s adjusted their Policy priority on aerospace development and public transportation as well. In short, PRR S1 #6100 looks like a rocket but it didn’t and never can take us to that creepy “natural satellite” in the space, The abandonment of Steam power development was inevitable, it is just a part of the plan of “ the highest levels, behind closed doors”......
Overmod Geometrically I think this wouldn't give the right 'thing', but having just confused a bunch of people with side-rod geometry over on RyPN I would revert to first principles. First, the 'basis' of limited cutoff relates directly to the location of the ports in the bushings, which is determined when the cylinders and bushings are cast and machined............the TE is going to be whatever the steam getting to the cylinders at that moment, on that particular day, produces at the wheelrims for torque. All these other figures are only approximations and possibly poor ones at that. The number that matters is the actual drawbar pull, and you can plot that as PRR did against speed to derive a performance curve that can provide DBHP (likewise the number that matters for horsepower).
Geometrically I think this wouldn't give the right 'thing', but having just confused a bunch of people with side-rod geometry over on RyPN I would revert to first principles. First, the 'basis' of limited cutoff relates directly to the location of the ports in the bushings, which is determined when the cylinders and bushings are cast and machined............the TE is going to be whatever the steam getting to the cylinders at that moment, on that particular day, produces at the wheelrims for torque. All these other figures are only approximations and possibly poor ones at that. The number that matters is the actual drawbar pull, and you can plot that as PRR did against speed to derive a performance curve that can provide DBHP (likewise the number that matters for horsepower).
Speaking of DBHP, it brings up another question about S1; the one and the only one 6-4-4-6 ever built in human history. The only source of S1’s DBHP is from Steamlocomotive.com, which is 7200hp (when hauling 1200 tons consist at 100mph), I can’t find another source of it. Maybe it is in the books which our forum members recommended in previous post but I haven’t bought or able to obtain all of them yet.
As we know the higher the speed of a train consist, the lesser power the engine need to tow that consist, thus at higher speed, steam locomotive use lower cutoff. The prototype of T1 #6110 “tested on the Stationary Test Plant in Altoona, developed 6,550 hp (4,880 kW) in the cylinders at 85 mph (137 km/h)” (quote from wiki), IIRC much powerful steam locomotive developed it maximum DBHP at much lower speed, take UP “Big Boy” 4-8-8-4 as an example; its firebox, boiler and total heating area were slightly bigger than S1, but It only developed 6,345 DBHP at 41.5mph.
Moreover, the test plant in Altoona was expanded for the new T1 prototype, which implies that S1 might never be tested on the test plant in Altoona, maybe there was another method to obtain the data of DBHP? All these things make the figures of S1’s 7200 DBHP sound suspicious to me. One year after S1 was put into service, The attack of Pearl Harbor happened, the whole nation needs some encouraging thing to improve morale, I wonder if this is one of the reasons why the 7200 DBHP figure was used?
Overmod.....I think, inherently, the way the S1 put so much of its overall weight on the lead and trailing trucks, without any kind of adjustable equalizing or unloading mechanism to put more weight on drivers for, say, starting, had already crippled its ability to run at any practical FA. Just curious, I understand the differences of trucks design between T1 and S1, was it possible to use softer suspension springs at both 6-wheel leading and trailing truck? Those trucks on S1 had independence suspension consist of coil and leaf springs, PRR could adjust them one by one independently according to their needs. By the way, if more weight was put on the drivers, would it excess the axle load regulation? Thank you very much! Overmod……Just as it would become agonizingly clear in no more than a couple more years that there was a very poor future for high-speed passenger service itself. And meanwhile, there was that huge investment in T1s, weighing down the books just at the time PRR needed 'better' power but impossible to peddle elsewhere... Meanwhile, the Q2s. Very successful design ... for what they were, engines that could move critical wartime freight in 150-car trains about as fast as anyone would care to take them…… I once thought that building some HSR which linked most of the tier one cities in North East in the 40s was the only way to compete with Airline or Greyhound. PRR or even NYCRR had the best tool like T1 and Nigeria but the coverage of their racetrack was not large enough. But if even Milwaukee Road Hiawatha also had the same decline, I think it was not only about speed but a trend which was irreversible. I don’t know why PRR has given up to raise the speed of their freight services after WWII. from Q1 to Q2, they were designed to express freight service, work best at speed. if PRR thought it was dangerous or impractical, why they designed and built them in the first place? 26 Q2 plus the total number of F7 needed to replace them involved tons of money, I love PRR’s trains, but I despise their leadership and management in the late 40s. Overmod Which is why I suspect, and argue, that The Duplexes Had To Die. And why there was, and in some respects still is, something of a conspiracy to make the locomotives and in fact the whole concept out to be a slippery total failure, a design disaster fully justifying early writeoff of a great deal of that $65 million so that the available credit could be released for things more useful in 1950s railroading. I heard from the previous post by our forum members that you have some evidence of PRR officials who wanted to make T1 a hopeless engine, do you mind telling us a little bit more detail about it? To be honest, I won’t be surprised if it was the truth! Just like many flagship corporations, they are always surrounded by leeches; their business partners, their own employees, government officials, bankers etc., milking the host and keep it alive at the same time so that they can milk it even more and longer.
Overmod.....I think, inherently, the way the S1 put so much of its overall weight on the lead and trailing trucks, without any kind of adjustable equalizing or unloading mechanism to put more weight on drivers for, say, starting, had already crippled its ability to run at any practical FA.
Just curious, I understand the differences of trucks design between T1 and S1, was it possible to use softer suspension springs at both 6-wheel leading and trailing truck? Those trucks on S1 had independence suspension consist of coil and leaf springs, PRR could adjust them one by one independently according to their needs. By the way, if more weight was put on the drivers, would it excess the axle load regulation? Thank you very much!
Overmod……Just as it would become agonizingly clear in no more than a couple more years that there was a very poor future for high-speed passenger service itself. And meanwhile, there was that huge investment in T1s, weighing down the books just at the time PRR needed 'better' power but impossible to peddle elsewhere... Meanwhile, the Q2s. Very successful design ... for what they were, engines that could move critical wartime freight in 150-car trains about as fast as anyone would care to take them…… I once thought that building some HSR which linked most of the tier one cities in North East in the 40s was the only way to compete with Airline or Greyhound. PRR or even NYCRR had the best tool like T1 and Nigeria but the coverage of their racetrack was not large enough. But if even Milwaukee Road Hiawatha also had the same decline, I think it was not only about speed but a trend which was irreversible. I don’t know why PRR has given up to raise the speed of their freight services after WWII. from Q1 to Q2, they were designed to express freight service, work best at speed. if PRR thought it was dangerous or impractical, why they designed and built them in the first place? 26 Q2 plus the total number of F7 needed to replace them involved tons of money, I love PRR’s trains, but I despise their leadership and management in the late 40s. Overmod Which is why I suspect, and argue, that The Duplexes Had To Die. And why there was, and in some respects still is, something of a conspiracy to make the locomotives and in fact the whole concept out to be a slippery total failure, a design disaster fully justifying early writeoff of a great deal of that $65 million so that the available credit could be released for things more useful in 1950s railroading. I heard from the previous post by our forum members that you have some evidence of PRR officials who wanted to make T1 a hopeless engine, do you mind telling us a little bit more detail about it? To be honest, I won’t be surprised if it was the truth! Just like many flagship corporations, they are always surrounded by leeches; their business partners, their own employees, government officials, bankers etc., milking the host and keep it alive at the same time so that they can milk it even more and longer.
Overmod……Just as it would become agonizingly clear in no more than a couple more years that there was a very poor future for high-speed passenger service itself. And meanwhile, there was that huge investment in T1s, weighing down the books just at the time PRR needed 'better' power but impossible to peddle elsewhere... Meanwhile, the Q2s. Very successful design ... for what they were, engines that could move critical wartime freight in 150-car trains about as fast as anyone would care to take them……
Overmod Which is why I suspect, and argue, that The Duplexes Had To Die. And why there was, and in some respects still is, something of a conspiracy to make the locomotives and in fact the whole concept out to be a slippery total failure, a design disaster fully justifying early writeoff of a great deal of that $65 million so that the available credit could be released for things more useful in 1950s railroading.
How about an entirely different perspective and one that cannot be dismissed in any way. So here goes.
After WWII the government had legitimate fears of a recession, as what happened after WWI. Everyone around at the time still remembered the Great Depression like it was yesterday. It was a frightening prospect to face going right back into it. Terrifying actually when you consider all of that war industry grinding to a halt, sending millions out of work and simultaneously millions of people coming home. As mentioned this did happen after WWI and it was ugly. Riots, uprising, unrest, massive unemployment, people died.
So at the highest levels, behind closed doors, it was decided to sell consumerism. Incredible consumerism on an unprecedented scale. After 2 decades of serious deprivation it was time to rekindle the fires with futuristic dreams.
All the technical know how we can come up with today for the T1's or the S1, or the Niagaras's, and all the armchair retrospective what ifs and deep insights are meaningless because society was irreversibly directed into a push button future. This did not happen in Europe or Japan, they were starving and picking up the rubble. The peace had yet to be won. It was way off yet in the future.
Steam, any steam, regardless, did not fit into any of it. The T1's horrible misfortune and rapid fall from grace was in its timing. 1945 to mid '46 was the only time period that a massive order of 50 of them would or could have been acceptable, as the full force a of new found direction and enthusiasm, now sanctioned and official policy, was just on the horizon, the next day if you will. Regardless of how functional or reliable they could be made, or how promising a future their 6 months of glory was and regardless of the dollars spent they absolutely had to go.
Also I think people were traumatized by the war, wether they served or not. I believe just about the whole of society was going through a PTSD type of mental condition at some level. This was recognized by learned folks, maybe not as PTSD, but a general discomfort and disorder. People were not thinking quite straight. The fix was to set society on a new path to an entirely new society, where the marvels of massive industrial production and capitalism, through sanctioned blatant consumerism could save the day. GM was one of the major leaders in this role, but really it was everyone, from Admiral TV's to Maidenform bras to Levittowns.
I can understand the demise of steam, essentially a loss of a whole technology and their builders in North America, and of course we are nostalgic for what we recall.
The rapid fall of the passenger train was part of this policy, a part that I believe was not necessary at all and a serious 'one bridge too far' mistake but was caught up in the maelstrom of the times.
Jones1945English is not my first language; would you mind telling me what is the $35000 was about?
It's the equivalent of 30 pieces of silver; the amount (in 1949 money) received for the S1 as scrap.
Anyway, PRR was a quitter of their “duplex movement” when their president Martin Clement announced to remove all steam engines from through passenger trains west of the electrified territory in 1948.
Not quite - the removal only involved the first-class trains (like the Broadway) although it can be argued that restricting a 120mph engine to secondary and mail trains is something of a waste of the potential.
More to the point, it was agonizingly clear in 1948 just as it was not at all settled in 1946 that there was a very poor future for large steam locomotives in high-speed passenger service. Just as it would become agonizingly clear in no more than a couple more years that there was a very poor future for high-speed passenger service itself. And meanwhile, there was that huge investment in T1s, weighing down the books just at the time PRR needed 'better' power but impossible to peddle elsewhere...
Meanwhile, the Q2s. Very successful design ... for what they were, engines that could move critical wartime freight in 150-car trains about as fast as anyone would care to take them. By the time you have to justify a four-cylinder design with dangerously-corrodible alloy-steel boiler and enormous water rate that reduces augment above 60mph on a railroad where no freight is supposed to move faster than 50mph, you should not expect to find that the design is worth All The Extra Work over, say, all those J1 versions which are perfectly happy in a 'sweet spot' around that speed.
In a long run, EMD's diesel might have saved a lot of money for PRR, but tons of money already spent on the duplex ... Not to mention The PRR bought some problematic early Diesel from Baldwin and Alco with tons of money, even more money was wasted.
Which is why I suspect, and argue, that The Duplexes Had To Die. And why there was, and in some respects still is, something of a conspiracy to make the locomotives and in fact the whole concept out to be a slippery total failure, a design disaster fully justifying early writeoff of a great deal of that $65 million so that the available credit could be released for things more useful in 1950s railroading.
In hindsight, if PRR used their money to further improve the performance of their Duplex like applying the Franklin Type B Poppet Valves on both T1 and Q2 or other steam locomotive instead of buying this and that, we might have seen a much “romantic” ending. :P
Well, there was just exactly that approach: the development of the 'system' as well as the approach to substitute piston valves and normal valve gear on the T1s, essentially reducing the unfamiliar technology to the equivalent of a couple of fancy Atlantics (see the unbuilt E8 high-speed Atlantic design for a comparable) with much more familiar characteristics for typical PRR engineers. In my opinion the mere fact that PRR proudly patented several aspects of the piston-valve conversion was an indication that they thought ... at that time ... it represented a good answer to making an exotic high-speed design a perfectly capable 100mph-peak/tested to 110mph locomotive. And that the T1a was by just about any measure ... except when you have $65M down the hole and many hundreds of thousands of near-future tinkering needed just to get them reliably ordinary. I suspect that Franklin itself would be expecting quite a bit of additional royalty money as well as cost-plus contracts to provide all the various B-2 parts to make the rotary-cam conversions, at which point I suspect that quite a few issues with rotary-cam gear longevity in general, some related to wear and stress of ball followers giving line contact (against increased spring return pressure to debounce the actual valves) bearing on expensive lateral-shifting variable cams, would have come up had for some quixotic reason PRR management decided to proceed with the full 1948 debugging and improvement program (which I firmly believe would have eliminated most of the substantive difficulties with using the T1s for reasonably high mileage in general service suited to their characteristics).
Jones1945Is it possible to adjust or increase the energy output and TE of a steam engine which was using limited cutoff, by changing the angle or modify the expansion link on the Walschaerts valve gear?
Geometrically I think this wouldn't give the right 'thing', but having just confused a bunch of people with side-rod geometry over on RyPN I would revert to first principles. First, the 'basis' of limited cutoff relates directly to the location of the ports in the bushings, which is determined when the cylinders and bushings are cast and machined. A major point of long-lap long-travel valves is that the valve runs through a fairly extreme distance (some of the last de Caso efforts over 16"!) so that it will be moving at high speed (and hence open and close quickly to steam) at the moment the steam edge is reached with normal cutoff setting. You will gain nothing by building the valve in such a way that it can be moved further to open it earlier or longer (which is what modifying the expansion link would have to do). Much of the 'Holy Grail' of valve design (see for example the theory and practice of Willoteaux valves) is involved in arranging for much higher mass flow of steam ONLY in the brief range where it produces effective MEP for traction at high speed: that is not something that jiggering simple-harmonic-motion gear will produce reliably. Likewise, a gear like Walschaerts has the same characteristics for closing exhaust that it has for opening to steam, whereas most of the important characteristics are very different ... hence the perceived importance in, say, the Franklin System or in British Caprotti for setting exhaust timing and duration very differently from admission.
Now, D&RGW had a device for adjusting lead (on some 4-8-4s and 4-6-6-4s) that performed some of what you're wanting to do -- see here for some interesting reference material. Note how Porta suggests this be 'optimized' with reference to pressure matching, then consider what the 'opposite side' regarding compression control would entail.
Assume I step into the cab of S1, the Reverser/Reversing lever was pushed to the forward max, does that mean its cutoff has been set to its maximum?
By definition, yes. If you were to look outside you would see the reach rods all the way to the end of the link, moved by the linkage from the power reverse cylinders.
... thus when the engine starts moving, it’s using maximum power and the TE would be 71900lbf instead of76,400 lbf since the machinery of the gears and everything related to TE has been adjusted to reach the 70% Limited cutoff setting?
Well no, not exactly; the TE is going to be whatever the steam getting to the cylinders at that moment, on that particular day, produces at the wheelrims for torque. All these other figures are only approximations, and possibly poor ones at that. The number that matters is the actual drawbar pull, and you can plot that as PRR did against speed to derive a performance curve that can provide DBHP (likewise the number that matters for horsepower).
I think, inherently, the way the S1 put so much of its overall weight on the lead and trailing trucks, without any kind of adjustable equalizing or unloading mechanism to put more weight on drivers for, say, starting, had already crippled its ability to run at any practical FA. I think it is clear that none of the engineers who developed duplexes quite comprehended the degree to which one of the engines would lose traction if the suspension unloaded one of the wheels, with pathetically underdamped compliance, at high rotational speed and high delivered wheelrim torque, although it is pretty clear they planned for high levels with the original (ridiculously high) FA on the T1 and then the initial redesign of the equalization that took it higher still!
So you have a terribly long, terribly heavy locomotive with short stroke and reliably, efficiently high boiler pressure, that right out of the box has very low FA while retaining an underdamped suspension but does not even allow the valve gear on the two engines to be trimmed separately. I do not need to write home to Mother to realize this dog is not going to hunt well except by combining nosing and rolling.
Jones1945In S1 case, which figure is more appropriate to use as official figure of its TE?
PRR naturally figured they shouldn't claim 85% MEP for the S1. What's the "appropriate" MEP to assume, for an angine that cuts off when the crank has reached 114 degrees? PRR apparently just took a guess at 80%, which gives the TE they claimed. (Dunno if the S1 had auxiliary ports.)
Similarly, what's "appropriate" for an I1 with 50% cutoff? Might depend on whether engineers could count on the auxiliary ports to work.
Overmod These are two vastly different things. The '85%' is a convention in the formula that corrects for pressure drop from nominal (safety-valve pop) boiler pressure to the actual pressure present at the cylinders to make power. The limited cutoff is a characteristic of the valve gear that closes the inlet ports to steam "early" even when the valve-gear mechanism is set to full gear, thereby forcing expansive working all the time. Yes, there were approaches to get around the issues of limited cutoff when starting, the most familiar being slot ports or 'Weiss' ports as Porta liked to call them. Remember that even with limited cutoff and long-lead long-travel valves, the valve heads and rings still run the full stroke of the piston valve. Providing some very thin slots communicating to throttled steam relatively early in the stroke gives some amount of admission corresponding to a steam edge earlier in the valve stroke -- but restricted by the relatively poor flow, wire-drawing effects, etc. of steam through the small aperture as rotational speed came up.
Yes, there were approaches to get around the issues of limited cutoff when starting, the most familiar being slot ports or 'Weiss' ports as Porta liked to call them. Remember that even with limited cutoff and long-lead long-travel valves, the valve heads and rings still run the full stroke of the piston valve. Providing some very thin slots communicating to throttled steam relatively early in the stroke gives some amount of admission corresponding to a steam edge earlier in the valve stroke -- but restricted by the relatively poor flow, wire-drawing effects, etc. of steam through the small aperture as rotational speed came up.
It’s my pleasure discussing with you and learning so much from your professional sharing here, Overmod! I am not familiar with engineering knowledge, but I think I get it, though I am not sure I 100% understand the whole thing, thank you for your patience in advance if I ask some silly question!
Overmod ……The low FA of the Glaze-balanced J would require very careful handling at low speed, although several factors of the design would make the almost-inevitable slips easier to recover from than, say, in the S1 or T1 as built.
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