Here is the optimum trackplan I have come up with:
For the space given, and operations sought, this is the best trackplan within minimal variable limits. Having a main yard on the layout, some of the other suggestions to be included (such as a sanding tower, etc.) can be instilled within the main yard.
Note: as previously mentioned, as the club layout is modular, these modules are made for each other, and not intended to inter-change with others. The 1'x8' main module is the only inter-changeable module in this circumstance, without the wye and yard(s) connection for continuous operation.
Thanks again everyone for your input.
Jeremy
1) To keep initial costs and maintenance as low as possible, a railroad will tend to use the simplest track configuration possible. The yard throat at down 4 over 3 looks to complex. It looks like you are trying to use some sort of compound ladder rather then a simple ladder.If you want to use a compound ladder, the track would be happier coming off the throught track.
2) A railroad would use a compound ladder only if the space available was very limited. They force the switchman to constantly cross the tracks which is a safty hazard.
3) If ths yard is at a division point instead of the end of the line, you might want two caboose tracks, one for each division. Since crew assignments are usually on a first in, first out basis, the caboose track will usually be double ended (as you have drawn). Things should be aranged to allow the caboose to be removed from an arriving train and to be placed on a departing train with as little switching as possible. Also note that there will need to be space for shed/s for the caboose supplies such as coal, lamp oil and so on.
4) The turntable should have an over shoot track opposite the entrance track so the engine will not run onto the ground is the hostler fails to stop in time. As long as you have the turntable, while not run a few tracks off it for storage.
5) The fueling area needs two areas, one for deliver of fuel from tank cars to the plant, one for actually feuling the engines.
Have fun
Great points:
1. Due to the fact that this is a club layout, and multiple operation is of interest realistic or not, I chose the compound ladder to provide a few more cars within the yard. Having a simple ladder (such as the one on the right), the last track would have only been just over 3 feet in lenght, vs. the 4 feet achieved.
The playout of operations has been viewed as multi-operational with minimal obstruction, granted it may not follow realistic engineering practices. Obviously, there are many possible solutions for this trackplan, but we have to keep in mind that not everyone is going to operate in a realistic sence, or a concience state for that matter!
2. This layout is a safety hazard! lol Maybe this could teach some members to be more aware.
3. A second caboose track could be installed in the future, and/or a turnout ,lessening the distance from caboose-to-train as drawn. Fortunately, there is some room available for a supply shed. (Thanks for pointing that out!)
4. Yes. good idea. It will be short, but still serve it's purpose. Oh storage, of course!!
5. This is why I joined the forum! Thanks!!
1st brief response before sleep... serious concern about safety only kicked in more recently with ltigation for injury compensation. while the County, State and RR police could beat the **** out of union members with something like impunity companies didn't worry too much about safety of this kind. Working men died to get the conditions we enjoy today... and their spouses and kids lost their livelihood.
2nd... the suggestion to kick the yard tracks out of the main contradicts the previous (more correct) suggestion to minimize tracks from the main.
(Reason for answer now... tonights job blew out Will get back with more).
This space reserved for SpaceMouse's future presidential candidacy advertisements
GR,
As the intermodal module is not shown in the sketch, the lower branch of the wye pictured, sets the tracks 7" from the edge of the module (where the ship will be located), and is a pretty straight approach. As drawn, the tracks crossing at a 90 degree angle over the wye is a budget conscious plan. We had the 90 deg crossing, so we might as well use it.
A few minor adjustments have been made to the latest sketch, and we are beginning to lay track. Though some of the plan is not agreeable by suggestors of this forum, and incorrect, relating to real life railroading, please remember it's still a model. It doesn't have to be perfect, nor follow prototypical guidelines, it just has to function, and from a club standpoint; for a number of lamens.
Thanks once again everyone for your informative suggestions. Without your help, this plan would have missed a lot of opportunitistic operation.
YVMRC
First, the Old Dog has found a couple additional pages on mechanical interlocking
http://www.nymr.demon.co.uk/signals/signalling_1.htm
http://modratec.com/
The above company apparently can provide software to design mechanical interlocking plants and marerials to actually build the interlocking frames.
Second, it is hard to say much about the above desigh without knowing more about the layout it is part of. The single ended classification yard on a wye might make good sense on a model RR. A train could be made of, enter a mainline oval, and make several loops before returning. Each station on the line could represent several different stations depending on which loop the was on. This might make the mainline run appear longer, but would be limited to low traffic densities. Otherwise, things would get confusing fast.
But on a real RR, such a yard might create some problems. For trains that are totally broken up and re-classifed, it would work. But would about freight trains that opnly change crews at this location? And what about freight trains that just drop and/or pick a cut of cars on the end? Are such trains going to need to back in or back out of the yard? Or are such trains to be handled else where?
Third, if a compound ladder is desired, the Old Dog would suggest using the deesign in Custom Line Layouts - HO Scale Railroads from Atlas. Their design would eliminate that gosh awfuil ugle hunp. Although the Old Dog can't not state it for sure, it would suspect that a real RR might run the rods for the inside turnouts under the outside ladder so the sitchmen would not need to cross the tracks to operate the inside turnouts.
First of all, thanks again Dog for the information. I have so much printed out to refer to! An interlocking tower is a part of the layout that helps set the scene for those who run in that era. With the potential expansion of the layout, it's beneficial to know where one should reside, and exactly how it operates. The inter-locking tower placement, and operation was inquired about, specifically for the wye, and yard lead(s) configuration, to accomodate the era that it would exist in. The intermodal lead, crossing the wye might represent a road accomodated by the tower, though not prototypicaly controlled, as a result of the era exchange. I can't thank you enough for your contributions.
As a two-year member, to a 20 year-old club, I have stood up to point the club in the direction of realistic model railroading, vs. "playing with trains" as has been, the casual openess of it's (the club's) product. I must heavily consider the aspect in planning, that some don't care about how it works, as long at it "works", and those that do, as well as individuals whom might be intrigued. This sets the table for an conflict conference, as everyone wants things a certain way. With that, my intervention in planning, accomodating, and explanation, results in a happy club. I cannot shut down each member's suggestions, and it's tough to weigh the variables, with the outlook of future membership of those who may not join because it's not realistic enough. Obviously, the club exists on membership dues alone.
Second, it is hard to say much about the above desigh without knowing more about the layout it is part of. The single ended classification yard on a wye might make good sense on a model RR. A train could be made of, enter a mainline oval, and make several loops before returning. Each station on the line could represent several different stations depending on which loop the was on. This might make the mainline run appear longer, but would be limited to low traffic densities. Otherwise, things would get confusing fast
The layout has a main, through yard which has been the main interaction of trains around the layout ( with the exception of a coal mine, a passenger depot, and the recent development of an oil refinery). There is about 178 feet of mainline (36 of which passes the main yard), and only three places to exchange with. I introduced this new yard for another interchange point, and the wye is a result of the lack of lateral space. This also presents opportunity for departing and arriving trains, as well as a challenge of operation, especially since an intermodal yard has been brought about.
At most, three members run the layout simultaneously, and with not much to interact with, it's easy to see why dust settles on the tracks so frequently.
The compound ladder I got out of a book of HO trackplans (borrowed the book, don't remember the title). I figured, heck, I can use the same number of turnouts, and be able to store up to three more cars in the same space. Okay, so you might say "hmmf, so what's three cars, when a simple ladder could make operation easier?" Again, I'm talking about a club, and everyone want's their cars on the layout.
With the provision of adding on, and a main passing through the yard, crew changes are feasable. The same with picking up and dropping off. Of course, not being a through yard, it will take several minutes longer to arrange, but the advantage in this case, might be the storage tracks on the opposite side of the mainline. Furthermore, with the destination of another yard on the layout, a point to point operation can now be achieved, as well as staging. The design of the main yard is quite versatile over the stub yard, so a manifested train out of the stub yard, could then be sorted and redirected out of the main yard. This makes the stub yard more of a destination or manifest (with the option of exchange and sorting)
a real RR might run the rods for the inside turnouts under the outside ladder so the sitchmen would not need to cross the tracks to operate the inside turnouts.
I didn't think about the operation of the switchmen, since it's a model railroad, but I understand this circumstance around track planning, in a real sense. This point I must dismiss for reasons previously stated.
You mention choosing a tower and tower location as being indicative of era in one of your recent posts.
Towers are expensive... to put it mildly. So two things happen... when money is available or the regulating authority steps in an old tower ceases to be modified to take on new developments and gets replaced with something more up-to-date.
For your purposes I would look at cheating.
You need to step back if you want to allow for different eras. (As I see it this is a bit difficult if you have an intermodal yard sitting there... it's never going to look right with steam locos... but that's democracy for you ).
What I would suggest you do is work out a basic timeline and the shape the layout would have been at key dates.
If you go back far enough you can broadly figure out what would have needed to be the track signalling sections and the towers (using Armstrong frames) in something like the 1950s.
Some towers may have been lost over the next 2 - 3 decades and the signalling for the surviving companies and tracks concentrated on a CTC board in one, maybe two, towers. Then, if you're lucky, things expand, the intermodal yard gets planned... and you end up with a shiney new tower. As I've said somewhere recently, you can have the old tower still there in alternate use or being removed to another site for preservation.
I hope this helps.
(PS did you get my e mails about the turntable? )
mtrails wrote: The layout has a main, through yard which has been the main interaction of trains around the layout ( with the exception of a coal mine, a passenger depot, and the recent development of an oil refinery). There is about 178 feet of mainline (36 of which passes the main yard), and only three places to exchange with. I introduced this new yard for another interchange point, and the wye is a result of the lack of lateral space. This also presents opportunity for departing and arriving trains, as well as a challenge of operation, especially since an intermodal yard has been brought about.
mtrails wrote: With the provision of adding on, and a main passing through the yard, crew changes are feasable. The same with picking up and dropping off. Of course, not being a through yard, it will take several minutes longer to arrange, but the advantage in this case, might be the storage tracks on the opposite side of the mainline. Furthermore, with the destination of another yard on the layout, a point to point operation can now be achieved, as well as staging. The design of the main yard is quite versatile over the stub yard, so a manifested train out of the stub yard, could then be sorted and redirected out of the main yard. This makes the stub yard more of a destination or manifest (with the option of exchange and sorting)
You are mixing apples and oranges. A yard is NOT just an yard! It is designed for a specific purpose. An interchange "yard" or track is simply a place where one railroad leaves cars to be picked up by another railroad. and the second railroad leaves cars to be picked up by the first railroad. It might be one track, pull the inbound cars and shove the outbound cars on to the track. It might be two tracks, one for inbound cars and one for outbound. An addition track might be provided for a run around. One end would be connected to track of the first railroad with a turnout locked with their switch lock (pad lock), the other end to track of the second railroad with a switch locked with the other road's switch lock.
Since interlocking towers are often used where two seperate railroads cross at grade, one may often find an interchange yard at such locations.
Also note, that at times railroads may do transferr runs where a cut of cars is moved from the classification yard of one road to the classification yard of the second. Of course, the roads must connect and allow trackage rights to each other..
If you want an interchange yard, the Old Dog would suggest that you consider a car float landing. That requires additional switching since one must keep the loads on the two sides some what in balance.
Another thought, make the intermodal yard a ship/rail facility. Then make the area where you have the yard a freight pier. Put two tracks down the middle in the warehouse, then one along each edge of the pier. That could provide a very interesting structure especially if you put it on piles.
If you intend the track labeled "through" to be a mainline track between two classification yards, you have a major problem. You need to provide a switching lead for the yard on the right side on the drawing. The whole idea of a lead is to allow the yard to be switched without fouling the main line. Also, you need to consider how you are going to remove the old engines from arriving trains and new engines. to departing trains.
Also, if the "through" track is to be a main track, you will need an arrival/departure track, and run around track for each yard.
mtrails wrote: The compound ladder I got out of a book of HO trackplans (borrowed the book, don't remember the title). I figured, heck, I can use the same number of turnouts, and be able to store up to three more cars in the same space.
The compound ladder I got out of a book of HO trackplans (borrowed the book, don't remember the title). I figured, heck, I can use the same number of turnouts, and be able to store up to three more cars in the same space.
Again, it is a matter of how you view the "through track". If it is a main track, the hump should stay to avoid an addition turnout in the main. But you may want to add some straight track before the switch for the caboose track to avoid a "S" turn problem and the resulting derailments.Otherwise, the Old Dog would suggest putting the turnout for the caboose track in the "through" track.
Old Dog
I suspect that you are asking mtrails to include too much of reality in a "democratic" club modell RR envionment. He'd probably go with some of our ideas if he could but he's tied up with what different, sometimes diverging, people want. This is only "representative" of the real thing in the broad sense... it is far more MRR functional.
Your ideas are good though... where someone has more opprotunity to apply them.
Dave-the-Train wrote: For your purposes I would look at cheating. You need to step back if you want to allow for different eras. (As I see it this is a bit difficult if you have an intermodal yard sitting there... it's never going to look right with steam locos... but that's democracy for you ).
Three possible cheats
1) Use interchangable modulars as mentioned above for different eras. When you want to run steam, replace the intermodal yard with a freight house and team tracks.
2) Model a railroad museum (from MR suggestion years ago.
3) Model a railroad scrap yard.
Dave, no I didn't recieve an e-mail from you regarding turntables. Thanks for reiteration to Dog about the club's democracy. Come to think of it, I didn't get notification e-mails that the above posts had been made. Hmmm...
You know, things would be so much easier if the club was set in one era, or time period! When the club ran on analog, there were FOUR main tracks! Immagine how dumb that must have looked. But obviously, to have enough track for everyone to "play" on. I have wondered why these guys simply like running trains. We have one young memeber (17) that I can understand just wanting to play, but the older guys? But i'm guilty too. According the schedule, the club has (I think) TWO prototypical operating sessions per Year. I'd like to see it at least once a month.
Regarding towers, if the idea for the intermodal yard hadn't come about, the wye-to-yard modules would have been catered to the steam/transition era. We have always wanted an intermodal yard, and never had a place for one, until this unique polygon module was made. But as Dog had suggested, perhaps a steam/transition era module could be inter-changed for scheduled operating sessions, and/or public viewing. Great idea Dog! Maybe in the future as we add on to the end of the current yard module, the intermodal yard could be relocated in a more realistic setting.
Refering back to the stipulations of the clubs needs and wants, this yard is percieved, and operated differently by it's user. As I had stated several threads ago about the commodities line, being located right next to the E/W mainlines, it is viewed as a road, not actualy next to the mainline, but it's own set of tracks, going somewhere else. This rule (grrrr) is also now applied to the stub yard, as any sets of tracks that can be used for an inter-change point if one wants to model that scenario, can be used in that way. It is confusing I know, but when i'm using the yard, I might use it for classifying. Someone else might use the yard (or a selection of tracks) as an inter-change point. I also think I said it wrong, when I said "used as another inter-change point". I basicaly meant to say, a place for added operation, and movements.
The through track lableing is a consideration of future expansion. Of course this would make it the mainline. I may have labeled the wrong track? I have been studying as many existing HO trackplans in MR, and see a lot of them with yards, that do foul the mainline, both through and stub. In our case, being space limited, the plan tries to accomodate as many yard functions as possible, though they may not be played out by the book.
I agree with your suggestion about the caboose track coming off of the through track. Thanks!
By the way, we do have a railroad scrapyard. I forgot about it until you mentioned it!
A couple of quick thoughts;
1) As you are probably aware, wyes (and reversing loops) require special wiring. That could get interesting!
2) Be sure you consider where the operators will need to stand when running the yards. You have the two yards (say the left yard and the right yards off the wye, plus the intermodal yard. If the two yards off the wye are to have seperate operators with their controls on the left side of the layout, you have a conflict since both operators will want to stand where they have the best view of threir resective ladders. If the right yard is controled from right side of the layout, there may be a conflict with the operator of the intermodal yard.
As far as conflicting ops go... use a Dispatcher / put the mains on one "through" Tower not located here and all the wye tracks on a local tower / CTC Board. Then you only have to "talk to each other" when you want to move from the main tracks to the wye/yards and vice versa.
Being on one tower doesn't mean that you can't have several things going on at once... the tower operator keeps them apart.
You moght like to think about only putting switches in the wye and where routes would conflict on the tower and keeping all the ladder tracks on ground throws. Less work for the towerman . Within each yard and its lead track a switching crew can trundle around so long as they stay clear of any fouling points and/or conflicting routes (mainly the diamonds).
With the through track you need to beware modelling a model. I realise that with much of the information we get coming from MRR mags this can be difficult. The thing to try to do is to look for phrases like "I did this to fit it in". The trouble is that books come in generations and where, years ago, people knew from "everyday experience" that a modeller was "cheating" to fit things in the generations have succesively lost the everyday experience and the books have carried over the ideas from MRR books without a comparison to the real thing or the same background knowledge to be able to see what is going on. I guess that the short version of this is to say that from slight variation we graduallly move to myth... if we're not careful.
Anyway... why shouldn't we just enjoy watching the trains trundle by!
[BOY! Someone has changed the setup in this system! Looks good so far]!
I'll try to resend nmy last 3 emails.
Dave-the-Train wrote: As far as conflicting ops go... use a Dispatcher / put the mains on one "through" Tower not located here and all the wye tracks on a local tower / CTC Board. Then you only have to "talk to each other" when you want to move from the main tracks to the wye/yards and vice versa.
True, but what the Old Dog was referring to above was the people operating the layout, NOT the tower operator/s. What I was trying to sayb was something like this; "When you position the operating controls for the layout, and the points of interest on the layout, try to do it in a manner where the club members will not want to want to be in the same space in the aisle at the same time."
Dave-the-Train wrote: Being on one tower doesn't mean that you can't have several things going on at once... the tower operator keeps them apart.
1) The tower operator would almost certainly be involved in the delivery of train orders to the passing trains. Note that there are two types of train order, some orders can be passed up on the fly using ahoop, other orders must be signed for requiring the train to stop. This would requirwe additional signals. The Old Dog is unsure of the relationship of such signals to the other signals in the interlocking.
2) The tower operator might be requried to control the operation of highway crossing gates near the tower.
3) In this situation this probably would not apply, buy at a junction, the operator might be required to function as a block operator on the branch if manual blocking was used on the branch.
Dave-the-Train wrote: You moght like to think about only putting switches in the wye and where routes would conflict on the tower and keeping all the ladder tracks on ground throws. Less work for the towerman . Within each yard and its lead track a switching crew can trundle around so long as they stay clear of any fouling points and/or conflicting routes (mainly the diamonds).
Absolutely! Trying to switch the yard/s with the tower controling the switches would be a communication nightmare. And one has to question if management would invest the funds for providing remote control and interlocking on the ladder tracks in a freight yard.
mtrails wrote: The through track lableing is a consideration of future expansion. Of course this would make it the mainline. I may have labeled the wrong track? I have been studying as many existing HO trackplans in MR, and see a lot of them with yards, that do foul the mainline, both through and stub. In our case, being space limited, the plan tries to accomodate as many yard functions as possible, though they may not be played out by the book.
The question depends on what is being modeled. If you are modeling a short line, a branch line, or a secondary mainline that does not see that much traffic, fouling the main is no big problem. But on a heavy usage double track mainline, it can attrack unwanted management attention in a hurry. It is a question of how you view your RR.
From your description of the club, it sounds like many of the members enjoy putting a train on the main, and letting it run and are not too much into operation. Making the yard/s a seperate "playpen" would allow them to enjoy the layout while you enjoy doing some switching with interfering with them.
I'm not sure but I suspect that you are overlapping two or more different train operating systems. Train Orders are basically a seperate system from CTC and Absolute systems controlling movements by signal indication. As far as I am aware the systems do not overlep but I am open to correction on this.
Also, as I understand it, Train Orders were given to trains at Train Order Stations/ Offices which did not necessarily have to be towers. Further towers were not necessarily Train Order stations/offices. This is similar to the fact that not all Signalboxes in the UK are Block Posts. The simplest examples in both countries are grade crossing towers/boxes... they may only look after the road crossing and do nothing to regulate trains except to control their movements over the crossing. They will be in the "information loop" (yeuk! I hate that jargon)! but they will not be working the regulating system. -- Incidentally; this is not a response to your point 2 above.
[Whether a box/tower has responsibility for a grade crossing is a different issue. In the UK at least (and I'm pretty sure in the US as well) grade crossings do not exist as far as the operating system goes. The regulating system keeps trains apart, routes them and brings them together under controlled conditions... this can be done within a specific system such as an Absolute Block System. Keeping traisn from hitting things on grade crossings that are controlled is a completely different issue. A controlled crossing (whatever gates'barriers there are or are not) is purely a signalling issue... when the crossing is protected (sometimes by gates/barriers) the signals may be cleared. These will control the movement of trains but not have a regulating function within the operating system. Got that? Good... just to confuse you signals will sometimes both control and regulate... as in where a tower/box is both looking after the crossing and regulating traffic as a Block Box/Tower.
What my last post was suggesting is that the tracks be divided up with one tower controlling all the movements on the main tracks (the two south tracks at the bottom of the diagram) and only the third track on each side of the wye board and a bit further away. This would leave the wye board (and adjacent boards) tracks - except the two main tracks at the bottom) in the control of a tower at the wye. Either directly or under the instruction of a Dispatcher the main tracks tower and wye tower would have to hand off and receive traffic between each other.
This is distinct from organising the practical 12"=1' world of MRR operators - your point is sound on that - If they start to seperate out the ops as I've suggested though it will help in making the decisions related to that MRR issue. The way I've looked at it is to ask how the real RR would divide things up for practical operation. Most MRR people don't have experience of this or means of understanding how things are divided up on the ground on the real RR... and "interpretation" ca be coloured by MRR experience and myth- some of the things I've seen as explanations of UK practice are mind boggling.
Okay... operating systems work with/using/through signal systems... but the two are not the same thing. Signals are one measn of communication. They are used to convey instructions according to the Rule Book and do so in the context of the operating system in force at the location. (As a simple example a two aspect colour light signal will look eaxactly the same externally whether it is being used in an area operated under Absolute Block, Track Circuit Block, Intermediate Block, Permisive Block, Staff and Ticket or Electric token Block - (All UK operating systems but with either quivalents or similar systems in the US). An Engineer knows which is which as part of his route knowledge.
A through track in a yard does not have o be a main track... it can just be a track that is left clear so that trains may work through the yard between main tracks or between main track and another facility, or between facilities.
In this context a through track wouldn't be a bad track to connect a caboose track (or a loco "ready track" to as it would normally be clear so that cabooses or locos could be scooted in or out of their tracks without any worry about what else was going on in the yard... and a yard track wouldn't be lost to keep access open.
Please don't take this as criticism...'cos that isn't what it is. Hopefully it will help you understand what is going on in a broader context.
Dave-the-Train wrote: I'm not sure but I suspect that you are overlapping two or more different train operating systems. Train Orders are basically a seperate system from CTC and Absolute systems controlling movements by signal indication. As far as I am aware the systems do not overlep but I am open to correction on this.
With CTC the signals basically communicate the "train orders" to the crew by signal aspect. It is a much newer process then the items the Old Dog is talking about.
Dave-the-Train wrote: Also, as I understand it, Train Orders were given to trains at Train Order Stations/ Offices which did not necessarily have to be towers. Further towers were not necessarily Train Order stations/offices.
Also, as I understand it, Train Orders were given to trains at Train Order Stations/ Offices which did not necessarily have to be towers. Further towers were not necessarily Train Order stations/offices.
True, in fact most "train order offices" were located at stations since stations are much more common then "towers". In some rare cases, in remote areas, there might be an "office" without a "tower" or "station" being present.
Almost all manned "towers" would be "TO offices", since they would need to coordinate with other RR installations by telegraph. If one has a telegraph operator present, he might as well handle TO's as needed. In fact, in a "tower" where two separate RR's crossed at grade, the "tower" would often be a "TO office" for both roads.
Dave-the-Train wrote: This is similar to the fact that not all Signalboxes in the UK are Block Posts.
This is similar to the fact that not all Signalboxes in the UK are Block Posts.
Same over here, in with an automatic (track circuits) blocking system the "block" signals would rarely be at stations or towers. The Old Dog was referring the manual (hand operated) block signals.
But clearly the interlocking towers would need to be tied into the block signals in some cases. Take a section of line, ABC with a crossover at B. It would make no sense to allow an west bound train to cross over at B to the south track if there was a east bound train on that track between A and B.
Dave-the-Train wrote: The simplest examples in both countries are grade crossing towers/boxes... they may only look after the road crossing and do nothing to regulate trains except to control their movements over the crossing.
The simplest examples in both countries are grade crossing towers/boxes... they may only look after the road crossing and do nothing to regulate trains except to control their movements over the crossing.
Same over here, in modern times crossing gates would usually be operated by a track circuit. In older periods they were usually operated by gate guards (not to be confused with the UK usage of "guard" which means train conductor).
Dave-the-Train wrote: [Whether a box/tower has responsibility for a grade crossing is a different issue. In the UK at least (and I'm pretty sure in the US as well) grade crossings do not exist as far as the operating system goes.
[Whether a box/tower has responsibility for a grade crossing is a different issue. In the UK at least (and I'm pretty sure in the US as well) grade crossings do not exist as far as the operating system goes.
True, the Old Dog was merely suggesting that if a highway crossing existed near enough to a tower, the RR might choose to have it operated from the "tower" to save the expense of hiring a "guard".
Dave-the-Train wrote: The regulating system keeps trains apart, routes them and brings them together under controlled conditions... this can be done within a specific system such as an Absolute Block System.
The regulating system keeps trains apart, routes them and brings them together under controlled conditions... this can be done within a specific system such as an Absolute Block System.
The word "Absolute" in ABS confuses the Old Dog. Home signals at an interlocking are always "absolute", the train stops and remains stopped until the signal clears. With "block" signals, it would seem to the Old Dog that two types are necessary. Take section of line, say ABCD with passing/meeting sidings at A and D. Clearly, the eastbound signal at A must be an absolute signal if there is a West bound train between A and D. Also, the West bound signal at D must be absolute if there is an East bound train between A and D. But otherwise, they can be "permissive" "stop" signals (stop and then proceed at restricted speed (10 mph)). The signal at BC would probably always "permissive" sense the can not prevent conflicting movements.
Dave-the-Train wrote: What my last post was suggesting is that the tracks be divided up with one tower controlling all the movements on the main tracks (the two south tracks at the bottom of the diagram) and only the third track on each side of the wye board and a bit further away. This would leave the wye board (and adjacent boards) tracks - except the two main tracks at the bottom) in the control of a tower at the wye. Either directly or under the instruction of a Dispatcher the main tracks tower and wye tower would have to hand off and receive traffic between each other.
Requiring the tower operators to coordinate their efforts might be a dose of real life, maybe too much of a dose. With the limited range of mechanical interlocking towers, such situations were normal in the early days.
Dave-the-Train wrote: (As a simple example a two aspect colour light signal will look eaxactly the same externally whether it is being used in an area operated under Absolute Block, Track Circuit Block, Intermediate Block, Permisive Block, Staff and Ticket or Electric token Block - (All UK operating systems but with either quivalents or similar systems in the US). An Engineer knows which is which as part of his route knowledge.
(As a simple example a two aspect colour light signal will look eaxactly the same externally whether it is being used in an area operated under Absolute Block, Track Circuit Block, Intermediate Block, Permisive Block, Staff and Ticket or Electric token Block - (All UK operating systems but with either quivalents or similar systems in the US). An Engineer knows which is which as part of his route knowledge.
I may be missing your point, or things may differ over here. Take semaphore signals; A "permissive
mtrails wrote: The compound ladder I got out of a book of HO trackplans (borrowed the book, don't remember the title). I figured, heck, I can use the same number of turnouts, and be able to store up to three more cars in the same space. Okay, so you might say "hmmf, so what's three cars, when a simple ladder could make operation easier?" Again, I'm talking about a club, and everyone want's their cars on the layout.
If you want to get the most cars in the yard, you might want to think about a switch back yard.
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Clearly we are falling over the issue of era and, sometimes individual RR's practices. We aren't going to solve this on a "generic" / "run what ya brung" layout. Mtrails is stuck with finding compromises. This is one reason I don't get much involved with club layouts.
As far as the laddr goes the main thing to watch out for is that too many changes of direction increases the likleihood of derailments/jack-knifing.
Absolute Block in the UK is different from ABS in the USA... which is why I wrote it out in full. It remains that a colour light signal head of a particular kind (in itself) can be doing one of several jobs (one at a time and one at each location - this is why engineers need route knowledge... have you ever thought about those signals having numbers plates etc? they're not very big are they? So a Driver has to stop to read them or know them from experience if he is rolling by).
Semahore arms in the US point the other way 'cos most of you drive on the wrong side - except the CNW for one... can't say that I've noticed where there semaphores are though as I model diesel era.
Train Order Signals (as you probably know) are usually just outside the office and back-to-back on the same post - so that on approach one arm sticking out to the right will show its face and the other, sticking out to the left, will show its back. Green/Board straight up meant clear to run through/no orders. Yellow/45degrees meant clear to run through BUT picking up Orders on the move (both loco and conductor). Red(???) /horizontal meant Stop and sign for Orders.
Now that the Old Dog has completed his battle with one of Microsoft Word's less useful features, automatic paragraph spacing, let's get started.
Dave-the-Train wrote: Clearly we are falling over the issue of era and, sometimes individual RR's practices. We aren't going to solve this on a "generic" / "run what ya brung" layout. Mtrails is stuck with finding compromises. This is one reason I don't get much involved with club layouts.
There is an old saying, "A camel is a horse designed by a committee."
Dave-the-Train wrote:As far as the laddr goes the main thing to watch out for is that too many changes of direction increases the likleihood of derailments/jack-knifing.
That design for a yard would be used strictly for car storage on a "real" RR for just that reason. It is an attempt to get as many cars as possible in a limited area. Such a yard would normal be in an area where land costs are low. It might for something like storing cars when a Midwestern RR is getting ready for the grain rush.
Dave-the-Train wrote:Absolute Block in the UK is different from ABS in the USA... which is why I wrote it out in full. It remains that a colour light signal head of a particular kind (in itself) can be doing one of several jobs (one at a time and one at each location - this is why engineers need route knowledge... have you ever thought about those signals having numbers plates etc? they're not very big are they? So a Driver has to stop to read them or know them from experience if he is rolling by).
First, note that there is fail safe feature, if the plate falls off, the signal must be treated as an absolute signal. The driver does not need to read the plate, he only needs to see that it is there. "Route knowledge" can be a "bad" thing. One driver I know got an unpaid vacation because the RR changed the speed limit on a section of track and he failed to notice the new sign and/or read the bulletin board.
Second, sins of omission are harder to detect than sins of commission. Where "route knowledge is important is when the driver fails to see a signal where he know one should be there. A dead signal, say burnt on lamp, is supposed to be treated as if it is displaying it's most restrictive aspect.
Dave-the-Train wrote:Semahore arms in the US point the other way 'cos most of you drive on the wrong side - except the CNW for one... can't say that I've noticed where there semaphores are though as I model diesel era.
We drive on "right" of the road, it is you all the drive on the incorrect side. ;-)
Dave-the-Train wrote:Train Order Signals (as you probably know) are usually just outside the office and back-to-back on the same post - so that on approach one arm sticking out to the right will show its face and the other, sticking out to the left, will show its back. Green/Board straight up meant clear to run through/no orders. Yellow/45degrees meant clear to run through BUT picking up Orders on the move (both loco and conductor). Red(???) /horizontal meant Stop and sign for Orders.
True, if the signal can display three aspects. But what if one is using two aspect signals such a lower quadrant semaphore? Two arms per direction?
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The Old Dog has this matter some additional though;
exPalaceDog wrote: The word "Absolute" in ABS confuses the Old Dog. Home signals at an interlocking are always "absolute", the train stops and remains stopped until the signal clears. With "block" signals, it would seem to the Old Dog that two types are necessary. Take section of line, say ABCD with passing/meeting sidings at A and D. Clearly, the eastbound signal at A must be an absolute signal if there is a West bound train between A and D. Also, the West bound signal at D must be absolute if there is an East bound train between A and D. But otherwise, they can be "permissive" "stop" signals (stop and then proceed at restricted speed (10 mph)). The signal at BC would probably always "permissive" sense the can not prevent conflicting movements.
First, the rule book referred to the squared end semaphore as an absolute stop. An interlocking home signal would be such a signal. But that does mean that such signal could NOT be used elsewhere for other purposes.
Second, it is mainly the dispatchers to keep trains moving in opposite directions from trying to occupy the same track between the same to sidings. The main function of block signals is to keep a following train out of the leading train's caboose.
Third, the situation about is something of a non-problem. If a east bound train is to follow another east bound train, the second train will only be held up until the first train passes signal B.