QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by Leon Silverman I recall reading about the PRR's experience regarding their E-units versis the T-1's they replaced. It appeared that the wheels of the diesels were requiring replacement far more often than the steam engines. Then they discovered that the diesel engines were accumulating mileage five times faster than the T-1's. How could this occur if the diesel's availability was less than the steam engine's? The T-1steam engine was considered state-of-the-art technology after WW II. Not real clear here if you mean wheel rotations, or miles. According to published statistics, the E Units had about half the diameter of the T-1, so it had to rotate twice as many times to achieve the same distance. For a unit to do the same work, on a rail-horsepower basis, the E-7 had to go 4 times farther to achieve the same amount of work as a T-1. That is, if a T-1 moved a given tonnage of freight 1,000 miles, then in order for four of the FT units to achieve the same movement, the total of four locomotive units is 4,000 miles, each unit traveling 1,000 miles. If it is wheel rotations alone, then the T-1 would have approximately 262,000 wheel rotations, while the FT units, with half the diameter wheel, would have approximately 2.24 million total rotations to haul the same tonnage the same distance. I can see why they had to replace the wheels more often. You can see that the wear and tear on the E-7 diesel, to achieve the same amount of work as something like a T-1, was relatively high. Herein, as well, is the "trick" of why measuring unit maintenance costs on a locomotive mile basis, which was a favorite methodology in certain kinds of studies, was much preferred over a unit maintenance cost per ton mile of freight moved, which you will almost never see in those "studies". Steam could always generate good numbers on a ton miles basis compared to Diesel, poorer numbers on a locomotive miles basis.
QUOTE: Originally posted by Leon Silverman I recall reading about the PRR's experience regarding their E-units versis the T-1's they replaced. It appeared that the wheels of the diesels were requiring replacement far more often than the steam engines. Then they discovered that the diesel engines were accumulating mileage five times faster than the T-1's. How could this occur if the diesel's availability was less than the steam engine's? The T-1steam engine was considered state-of-the-art technology after WW II.
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QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by M636C QUOTE: Originally posted by MichaelSol Well, for TomDiehl's example, since 50% of the units were different, A & B, if an A unit failed, bringing out a B unit didn't do much good. So, the redundancy had to be double that of Steam right off the bat. That isn't quite true. In general, you only needed one A unit per set of locomotives. So if an A unit failed, you could couple up a B unit (even with FT units, as long as they had couplers and not drawbars). This was proven by Santa Fe who purchased many of their early FT sets as A/B/B/B, at least until they could reach an agreement with the unions that a crew wasn't needed in the rear cab, at which stage they purchased a lot of A units to make up A/B/B/A sets. Following was the actual production: 555 A units, 541 B units If four unit sets, this suggested that 97% of such sets had an A unit on each end.
QUOTE: Originally posted by M636C QUOTE: Originally posted by MichaelSol Well, for TomDiehl's example, since 50% of the units were different, A & B, if an A unit failed, bringing out a B unit didn't do much good. So, the redundancy had to be double that of Steam right off the bat. That isn't quite true. In general, you only needed one A unit per set of locomotives. So if an A unit failed, you could couple up a B unit (even with FT units, as long as they had couplers and not drawbars). This was proven by Santa Fe who purchased many of their early FT sets as A/B/B/B, at least until they could reach an agreement with the unions that a crew wasn't needed in the rear cab, at which stage they purchased a lot of A units to make up A/B/B/A sets.
QUOTE: Originally posted by MichaelSol Well, for TomDiehl's example, since 50% of the units were different, A & B, if an A unit failed, bringing out a B unit didn't do much good. So, the redundancy had to be double that of Steam right off the bat.
QUOTE: Originally posted by futuremodal Tom, I think that steam had less likelyhood of road failure than the early diesel consists, precisely because steam utilized more preventive maintenance as part and parcel of regular maintenance. Conversely, those diesels had many more "maintenance free" parts that, due to the lack of *required* maintenance, were more likely to fail out in the middle of nowhere, e.g they didn't bother to check every wire and relay everytime, did they?
QUOTE: Originally posted by FJ and G "goodyear and big oil crushed the interurbans and trolley's" they didn't????????????????????? [?][:(][:O][8)][:D]
Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.
QUOTE: Originally posted by balboa110 Train crew size dropped dramatically also, but occurred over a longer period of time. What was the train crew size with triple headed steam? 10? With three diesels? 2?
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl [The statistic being quoted wasn't "failure" it was "availability." In my example, the one unit that failed was in its 13% non-available range, while the other 3 units, since they could be operated without the one that failed, were in their 87% available range. The use of the unit quantity multiplier was, therefore, not valid because the other three units could still do their job. Doesn't work that way. Three units as a "locomotive" would have a 65% availability. However, in this instance, the failed unit is still part of the statistical pool. The availability rate is still 57%. If there is a backup unit sitting somewhere, then that is part of the statistical pool and the availability rate is 50%. Now, the flaw above is the artful conversion of the economic impacts of the statistical problem into a practical problem on the road, for which, as was pointed out, very little data exists to form a conclusion. However, we do know exactly what the economic data is, and we have a compelling statistical explanation for it. Interestingly, the industry has a practical experience as well, shown by railroads attempting to get back to the road Steam model -- as much horsepower as possible in single units and as few "building blocks" as is feasible on the trains. Because they learned the hard way that they couldn't fight the statistical inevitability of the original MU model of low horsepower units.
QUOTE: Originally posted by TomDiehl [The statistic being quoted wasn't "failure" it was "availability." In my example, the one unit that failed was in its 13% non-available range, while the other 3 units, since they could be operated without the one that failed, were in their 87% available range. The use of the unit quantity multiplier was, therefore, not valid because the other three units could still do their job.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by Murphy Siding My point is, MichaelSol is stretching things a bit to just disregard this little point . Disregard? To the contrary, it was my exact point: what is the economic gain if the assembly line product costs more per rail horsepower to buy and costs more to maintain than the "custom" product? Exactly what is the benefit of the assembly line in that instance? And I do think it is stretching things to ignore that particular point.
QUOTE: Originally posted by Murphy Siding My point is, MichaelSol is stretching things a bit to just disregard this little point .
Thanks to Chris / CopCarSS for my avatar.
QUOTE: Originally posted by wallyworld The root of statistical evaluation in this case is failure-whether it is steam or diesel motive power. I know of no statistics available of road failures comparing the percentage of each. I do know that in the early days of diesels, regardless if it was Alco-EMD-Baldwin-road failures were not an uncommon event. That is why field technicians were the norm on road units. It also depends on the quality of maintenance of steam the quality of which deteriorated in the transition period. PRR is the most notorious example. So with all of this in mind-both sets would be skewed.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl [One thing not considered in this statistical exercise is the fact that the failure of one of the locomotive units did not sideline the entire set, what the diesel manufacturers called the "building block concept." The failed unit could be uncoupled, leaving the rest of the set to operate, or have another unit substituted. Another advantage of the MU concept. Adding a unit to the pool as backup does not improve the failure rate. Rather it required increased redundancy, at extra cost, and only degraded the overall availability statistic even further because then you have five units instead of four in the statistical pool, and the availability statistic drops to 50%. Try as you might, you can't beat the statistical odds which worked strongly against the economic efficiency of the multiple unit concept in attempting to replace high horsepower single unit motive power. The failed unit was rarely sitting in a yard, conveniently announcing in advance it was going to fail. It usually occured in service. Not too many standby units sitting on sidings along the way waiting to serve.
QUOTE: Originally posted by TomDiehl [One thing not considered in this statistical exercise is the fact that the failure of one of the locomotive units did not sideline the entire set, what the diesel manufacturers called the "building block concept." The failed unit could be uncoupled, leaving the rest of the set to operate, or have another unit substituted. Another advantage of the MU concept.
QUOTE: Originally posted by vsmith Regardless of whether Steam was or wasnt at that time more efficient than dismals, the long term advantages of dieselization was pretty clear to the RR company bean counters in the front office.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by wallyworld In engineering, which is what I did- a critical assumption is a assumption. If you read the few papers that are produced on this topic-steam versus diesel may not be as clear cut a issue as many assume. http://www.5at.co.uk/Roger%20Waller's%20IMechE%20Paper.pdf Most international motive power experts that came and looked at America's dieselization efforts came away with the same conclusion. There were some advantages, there were some disadvantages, but it was nothing like what the dieselization advocates claimed. For instance, one statistical sleight of hand, which has already appeared on this thread, was the "availability." One reason the rail industry is interesting because of so many things it does on a daily basis so well. That stands in marked contrast to strategic decisions by which the industry regularly seems to shoot itself in the foot, or wheel, if you will. GM proudly claimed availability of 87% or more on its diesels, compared of course to the dismal 61-68% for steam. Statistically, that was a falsehood; absolutely unequivocally false. But every mechanical officer in the country bought it. Why was it false? Because, the statistic was only for the the single unit with a rail hp output of 1350 hp. But, it took four of those units to generate the 5,400 rail hp necessary to equal the single steam engine. That meant 64 cyclinders, four generators, four sets of control equipment, 4,800 gallons of fuel, 800 gallons of lubricating oil, 920 gallons of cooling water and thousands of moving parts operating at temperatures and combustion pressures far in excess of anything on the steam engine the four unit set replaced. Each unit, however, represented a distinct, independent statistical probability -- 87% availability. The law of probability for events with statistical independence is that the overall probability of failure is the multiple of the probability of each independent event. The statistical availability of the four unit FT set, then was the multiple of 87%, four times. A four unit FT set, then, had a statistical availability of only 57%. substantially lower than the steam engine it replaced. The substantially lower annual mileage of diesel locomotives compared to their road Steam counterparts is one of the puzzling artifacts of the statistical record which never gets an explanation. Well, now you know why. One of the unavoidable consequences of multiple unit operation of low horsepower units was the substantially lower availability of diesel sets, compared to the steam they replaced.
QUOTE: Originally posted by wallyworld In engineering, which is what I did- a critical assumption is a assumption. If you read the few papers that are produced on this topic-steam versus diesel may not be as clear cut a issue as many assume. http://www.5at.co.uk/Roger%20Waller's%20IMechE%20Paper.pdf
QUOTE: Originally posted by TomDiehl QUOTE: Originally posted by Murphy Siding QUOTE: Originally posted by MichaelSol Well, the ultimate costs per 1000 tons of freight moved showed that this proposition wasn't true. The costs of steam were about the same as the costs of diesel. That included labor. Notwithstanding the mass production arguments, diesel locomotives cost more per rail hp to purchase than steam. Therefore, the rate of return had to be less. Why do you think that was? Best regards, Michael Sol I'm not so sure you can just ignore that point, just for the sake of supporting your idea? Not just that point, but the point of standardized (interchangable) parts threw a BIG advantage to the diesel. For example, you couldn't order a new piston for your steam locomotive from the manufacturer, take it out of the box (crate?) and install it, it had to be machined to fit. Or the manufacturer had to custom machine it for you to your dimensions. You could order a new piston for your diesel from EMD and it would be a direct fit right from the box. One of the major reasons that many railroad machine shops closed down after the conversion as documented in "Diesel Victory," a recent special issue from Classic Trains.
QUOTE: Originally posted by Murphy Siding QUOTE: Originally posted by MichaelSol Well, the ultimate costs per 1000 tons of freight moved showed that this proposition wasn't true. The costs of steam were about the same as the costs of diesel. That included labor. Notwithstanding the mass production arguments, diesel locomotives cost more per rail hp to purchase than steam. Therefore, the rate of return had to be less. Why do you think that was? Best regards, Michael Sol I'm not so sure you can just ignore that point, just for the sake of supporting your idea?
QUOTE: Originally posted by MichaelSol Well, the ultimate costs per 1000 tons of freight moved showed that this proposition wasn't true. The costs of steam were about the same as the costs of diesel. That included labor. Notwithstanding the mass production arguments, diesel locomotives cost more per rail hp to purchase than steam. Therefore, the rate of return had to be less. Why do you think that was? Best regards, Michael Sol
Have fun with your trains
QUOTE: Originally posted by futuremodal QUOTE: Originally posted by Murphy Siding QUOTE: Originally posted by MichaelSol Well, the ultimate costs per 1000 tons of freight moved showed that this proposition wasn't true. The costs of steam were about the same as the costs of diesel. That included labor. Notwithstanding the mass production arguments, diesel locomotives cost more per rail hp to purchase than steam. Therefore, the rate of return had to be less. Why do you think that was? Best regards, Michael Sol I'm not so sure you can just ignore that point, just for the sake of supporting your idea? So why do you think steam couldn't/can't be mass produced on an assembly line? The fact that steam was custom built back then was just the modus operandi of the steam builders. Remember, the Ford auto plants were only a decade or two old back then, so mass production en masse for US producers wasn't yet the prefered way. FYI, one of the primary reasons Baldwin failed so miserably in its diesel production was that it tried to build diesels the same way they built steam, e.g. customization.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl Or back to the original question: How many of even the latest steam locomotives have the capabilty of being MU'd? It is true that diesels had to have the mu-ing capability to provide the same horsepower as a single unit steam. What is interesting is how little of a change mu-ing made to train operation; the train size statistics changed little.
QUOTE: Originally posted by TomDiehl Or back to the original question: How many of even the latest steam locomotives have the capabilty of being MU'd?
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl If existing low water alarms were reliable at this point in history, why did boilers still have sight glasses and try cocks? How many steam engines were built with 1950's technology?
QUOTE: Originally posted by TomDiehl If existing low water alarms were reliable at this point in history, why did boilers still have sight glasses and try cocks?
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl As I stated above, not with a crown sheet failure, which would be more possible if nobody is in the cab to monitor the boiler water level, especially with the technology of the 50's. The technology of the 50s. Hmmm. The transistor, satelites in space, the jet engine, high temperature, high impact ceramics, the first commercial computers, the first production of electricity from atomic energy, super glue, power steering, the videotape recorder, bar codes, radial tires, vaccine for poliomyelitis, color TV, teflon, fiber optics, microwave ovens, hovercrafts, the laser, integrated circuits, etc. etc. But with "the technology of the 50s" they couldn't figure out a way to monitor boiler water levels? I'm skeptical.
QUOTE: Originally posted by TomDiehl As I stated above, not with a crown sheet failure, which would be more possible if nobody is in the cab to monitor the boiler water level, especially with the technology of the 50's.
QUOTE: Originally posted by MichaelSol During dieselization, overall speed limits were reduced on equivalent track from the standards prevalent during the steam era. Why would that happen if Diesels were easier on the track structure than Steam? Best regards, Michael Sol
QUOTE: Originally posted by youngengineer I think with this discussion one fact is overlooked, the most exspensive part of the railroad is manpower. Its not fuel, track maintenance, water, what ever else you want to try to average together and compare. Today your typical train has a conductor and an engineer, if you bring back the steam engine you must add a fireman, therefore steam is no longer viable. In the near future it looks like that a train may have only one person on board, an engineer, this would never be possible with a steam engine, once again steam will always be found in museums only. Somewhere down the road in the future, I know i will be shunned for this comment, diesels may be run by satelite, need for anyone on the train itself possibly nill, once again steam engine, no one on board run by computers not gonna happen. One point that I had not seen brought up was the fact that steam engines are 1 of a kind, they dont lend themselves to mass production, hence one of the major problems for baldwin, alco and the like was lack of mass production capacity, everything was hand built. The need for interchangeable parts is necessary for a modern product, if you cant change out parts easily than the cost of replacement is astronomical. I could be wrong and Im sure I will be shown the errors of my ways but I think that personel costs alone would doom the steam engine today.
QUOTE: Originally posted by ardenastationmaster [What did it for the diesel was availability. The diesel, even in its formative years, had an availability of 80% (today it's even higher). The steam locomotive's availability hovered around 50-65% at best. Almost half its life was spent being tweaked and tightened up in the backshop. Out on the road, steam had an ugly habit of hammering the rail every time the piston and main rods came down. "Dynamic augment" was never fully overcome during the steam era. With its large driving wheel base, the steam locomotive always "hunted" going down the track, putting forces on the sides of the rail, both of which might explain why CWR didn't become popular until after steam was retired.
QUOTE: Originally posted by wallyworld Just a note-some steam took on water on the fly.It was called a track pan. It was a water trough between the rails.It was pretty spectacular-to see that all that weight and power slam thru a lowered scoop on impact when it hit the water.
QUOTE: Originally posted by James_the_Mad One question: Are steam locomotives harder on the physical plant - that is, the track, switches, etc? I seem to recall one poster speaking of the pounding the rails receive from steam engines. I would also be concerned about the affect of 4 or 5 drivers, with no flexibility, on a curve. All this compared with the much shorter trucks on 6-axle locomotives. Three fixed axles on an SD9 or SD40-2 have a much shorter wheelbase than even aPacific, and they're fairly short compared to a Mikado or one of SP's big Cab Forwards. Also, what was the overhead of maintaining watering towers - not just the cost of the water itself, but the building and maintenance of the towers, taxes, the extra watering stops, etc? Yes, maybe that could be offset with larger tenders or separate water tenders, but what impact does adding a tender (or for long-range operation, multiple tenders) do to the equation? I suspect there is more to the equation than simply fuel and maintenance costs of the locomotives themselves.
QUOTE: Originally posted by MichaelSol Relief valves do, in fact, prevent boiler explosions. Statistically, head on collisions were more likely than boiler explosions. Best regards, Michael Sol
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by Randy Stahl Electric locomotives are provided with fuses and or circuit breakers to protect the equipment there is very little you can do to detect imminent boiler exposions due to an exposed crown sheet . Well, even kitchen pressure cookers had a relief valve. Best regards, Michael Sol
QUOTE: Originally posted by Randy Stahl Electric locomotives are provided with fuses and or circuit breakers to protect the equipment there is very little you can do to detect imminent boiler exposions due to an exposed crown sheet .
QUOTE: Originally posted by Randy Stahl Multiple unit was invented by Frank Sprague in 1901 , regardless of the fact MU technology did exist for many years of the steam era , I would not want the challenge of applying it to a steam locomotive. I would think that the possibility has been thought about and assessed to be impossible. Randy
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl With the technology available in the late 40's or 50's? Those vacuum tubes would have a short life in the hot cab. And solid state in those days? Nonexistant, and when it did show up, VERY temperature sensitive. Not likely. You're citing technology that was on the drawing board when they were playing with the ACE3000. Just a FEW years after the change over. Same technology that allowed Diesel "mu-ing". The 1955 "Diesel Synchronous Controller" I have sitting here in front of me has no vacuum tubes.
QUOTE: Originally posted by TomDiehl With the technology available in the late 40's or 50's? Those vacuum tubes would have a short life in the hot cab. And solid state in those days? Nonexistant, and when it did show up, VERY temperature sensitive. Not likely. You're citing technology that was on the drawing board when they were playing with the ACE3000. Just a FEW years after the change over.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by TomDiehl [With the technology available in the late 40's or 50's? Those vacuum tubes would have a short life in the hot cab. And solid state in those days? Nonexistant, and when it did show up, VERY temperature sensitive. Ironically, it was the same technology that allowed Diesels to be "mu'ed".
QUOTE: Originally posted by TomDiehl [With the technology available in the late 40's or 50's? Those vacuum tubes would have a short life in the hot cab. And solid state in those days? Nonexistant, and when it did show up, VERY temperature sensitive.
QUOTE: Originally posted by wallyworld Wardale goes beyond simply talking or theorizing about steam motive power, He is actually developing a design in real world terms Thats what I meant by putting his money where is mouth is..He seems to be doing quite well.I wish him well and should he solicits a donation-I will contribute. Thats what i can do in regard to following his example.I hope others do so as well.
QUOTE: Originally posted by Safety Valve I disagree with the assessment that wartime traffic beat steam to death. I bet the Nation's War Traffic must have seen the highest tonnage ever asked of railroading, steam or desiel.
QUOTE: Originally posted by wallyworld Heres someone who is putting money where is mouth is and is bringing steam forward into the 21st Century. This is the 5AT Project-David Wardale is one bright guy with a track record of success. Projected 50,000 miles between maintenance overhauls. Great stats and comparisons. Wheres Ross Rowland when we need him? http://www.5at.co.uk/
QUOTE: Originally posted by Paul Milenkovic Well, I guess I do want to beat that dead horse! I really think it was the maintenance costs. You have the 1) Diesel can be MU'd, steam cannot, 2) Diesel uses a lot less fuel, 3) steam pounded the rails, 4) steam had the water supply problem, 5) Diesel took less maintenance, 6) railroads beat their steam locomotives to death in WW-II traffic surge and were ready to replace the whole fleet. All of these points had answers or lack of answers in some degree. But I still think that steam is maintenance-expensive -- the prep to get a steam loco going from cold start, the handling and facilities for water-coal-ash, the boiler inspections and safe operation of a boiler (related to a vapor cycle and working fluid phase change -- gas cycles can blow a cylinder or a turbo and it is usual not a fatal accident), the tradeoff between putting money into water treatment or cleaning out the boiler, cleaning the flues, replacing flues.
QUOTE: Originally posted by MichaelSol QUOTE: Originally posted by Paul Milenkovic You have the 1) Diesel can be MU'd, steam cannot, 2) Diesel uses a lot less fuel, 3) steam pounded the rails, 4) steam had the water supply problem, 5) Diesel took less maintenance, 6) railroads beat their steam locomotives to death in WW-II traffic surge and were ready to replace the whole fleet. I almost never see numbers in support of contentions like this, even though railroads were and are a data rich source of detailed information. A couple of points. 1) Steam can be mu'd. Coal or fuel oil, an automatic stoker or feed is electronically controlled. Best regards, Michael Sol
QUOTE: Originally posted by Paul Milenkovic You have the 1) Diesel can be MU'd, steam cannot, 2) Diesel uses a lot less fuel, 3) steam pounded the rails, 4) steam had the water supply problem, 5) Diesel took less maintenance, 6) railroads beat their steam locomotives to death in WW-II traffic surge and were ready to replace the whole fleet.
QUOTE: I talked to some former steam men-they didnt miss leaning out a cab looking down a boiler barrel peering into the darkness looking for a signal or a hoop or the heat of a firebox in summer-but when I heard them talk, the way they talked and sometimes they said it was like nothing else and in their own way, it was like they lost a freind when the diesels came.
If GM "killed the electric car", what am I doing standing next to an EV-1, a half a block from the WSOR tracks?
QUOTE: Originally posted by wallyworld Labor intensive in terms of manpower.
QUOTE: Originally posted by tomtrain Not implying that diesel wouldn't have won the day. The speech is from 1935 with improvements in diesels to come also. What's interesting to me is this is pretty much rearranging deck chairs on the Titanic. Passenger trains didn't survive the bottom line, and a whole lot of freight, too. The climate was not favorable to railroads. As Ed has commented before, as long as there's heavy and bulky and dangerous stuff that needs to be moved, the railroad will hang in there. And lines west of the Mississippi have the advantage of great distances.
QUOTE: Originally posted by dave e Costs eliminated with the end of steam: water tanks, track pans coal handling, dozens of cars a day for a major terminal boiler washouts every month blacksmiths, boilermakers, machinists ash handling and disposal standby costs, hostlers & firemen to keep steam up when not on the road elimination of intermediate engine terminals (Crestline OH on PRR)
QUOTE: Originally posted by tree68 One number that definitely fell to the Diesel's favor was the drastic reduction of labor necessary.
QUOTE: Originally posted by lonewoof The railroads all got sold a bill of goods when they Dieselized?
Larry Resident Microferroequinologist (at least at my house) Everyone goes home; Safety begins with you My Opinion. Standard Disclaimers Apply. No Expiration Date Come ride the rails with me! There's one thing about humility - the moment you think you've got it, you've lost it...
Remember: In South Carolina, North is southeast of Due West... HIOAg /Bill
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