YAPP / PBS Junctions and Stations

[el koeno]

I don't agree. Check my analysis and more about YAPP.

That's personal taste. I like to build somewhat realistic networks. That includes going round mountains and lakes rather than going through or over them. Same for bridges, I only use them I really need them.

Well, you were talking about 'fun' not about 'taste' (imho its very easy to 'just build' some tracks and add some path signals).
Of course the tastes differ and I wanted to show some other points of view, i.e. the efficiency of tracks built with path signals.

Regards, Osai

There are different views on efficiency possible though. You might view super junctions with optimal flow as highly efficient. But if there's not much gain over a simple level crossing (e.g when there's low traffic) it's a horribly inefficient way to allocate your financial resources. Not that it's the kind of efficiency that really matters in a game like this, where you really have to be creative to find ways to spend your money (sometimes I build a high mountain in the sea for my HQ), but still.

[Ben1338]

My advice on how to place PBS is at junctions where you want more then one train entering a small junction at the same time and use normal signals after the junction it's self (make sure that you leave enough room for a train to squeeze in).

So Lets say you want a one way 2 platform station with cross overs at both ends.

You want the PBS for trains going out of the station and normal signals after the crossover and no signals between the station and the crossover. (the PBS would stay red if both tracks are taken and if a track is free then the train would reserve the line eliminating another train from reserving the section track.) like Eddi had said earlier.

[ostlandr]

I never mix PBS and normal signals. As long as there are PBS singals facing IN towards the platforms, trains seem to find open platforms very nicely, and will wait patiently (well, sort of patiently) for an open platform. If I need to prevent a train from "queue-jumping" or going the wrong way on a stretch of track, I just use the one-way PBS signal.

I used a station with two one-way platforms in a game the other day, instead of the usual bi-directional platforms. In this case, I made the PBS signals both face the direction of travel, so a train would stop just short of the platform. No crossovers needed in this design, which was important due to space concerns. Plus, it was the "B" station in an A-B-C-B mail & passenger route, so the trains were only going one way at a time without the need to reverse. (There were also trains running "express" from A-C, but they used a separate bypass track around city B.)

My advice on how to place PBS is at junctions where you want more then one train entering a small junction at the same time and use normal signals after the junction it's self (make sure that you leave enough room for a train to squeeze in).

So Lets say you want a one way 2 platform station with cross overs at both ends.

You want the PBS for trains going out of the station and normal signals after the crossover and no signals between the station and the crossover. (the PBS would stay red if both tracks are taken and if a track is free then the train would reserve the line eliminating another train from reserving the section track.) like Eddi had said earlier.

[trainboy2004]

Hey,

I'm currently creating a scenario with lots of single track railways. Now I was wondering is the following possible with YAPP/Pre/Basic signals?

I've made a Visio drawing to explain the situation. So I would like to see diagram 1, without the problem of diagram 2.

problem single track.pdf

the problem

(91.79 KiB) Downloaded 193 times

[ige]

No signals on single tracks and your problem has gone

[trainboy2004]

Is diagram 1 then still possible? I want 2 or more trains after each other between the passing points.

[ige]

If the single track is only one way, no problem.

[trainboy2004]

It's bidirectional look at the arrows.

[ige]

No chance for this layout if one train comes from the other side (deadlock shown in the 2nd diagram)

[Gen.Sniper]

On single track I sometime use PBS signals witch can be driven throught... but you MUST give ON END of single track... I use them for one universal track for use by Fast and freight trains...

[Ralph]

Hey,

I'm currently creating a scenario with lots of single track railways. Now I was wondering is the following possible with YAPP/Pre/Basic signals?

I've made a Visio drawing to explain the situation. So I would like to see diagram 1, without the problem of diagram 2.

problem single track.pdf

I don't think that is possible, you will have to have only 1 train on your single track at a time, there is no way the signal can tell which direction the train in the block its guarding is going and let more in the same direction.

[trainboy2004]

Ok thanks.

I saw this types of signals in transport gaint. I thougt it might be possible with PBS and some other signals combined.

[samjville1]

Here's me just chucking track down and hoping for the best ^^ lol

myjunction..png

how did you get double unit signals

[Michi_cc]

I thougt it might be possible with PBS and some other signals combined.

It is possible to split a track in two sections, but not in three or more. The screenshot shows how it can be done. The german forum has some more tips.

Single track split

01-02.png (5.95 KiB) Viewed 2525 times

-- Michael Lutz

[trainboy2004]

Nice thanks a lot.

[Gen.Sniper]

I think that idea can cause deadlock

[trainboy2004]

No, it does it work. I've created a worse case scenario. The train halted before the switch.

[Brianetta]

I think that idea can cause deadlock

It can. Two trains can reserve paths to the signal on the two-way section at a time. They will both move to their respective safe waiting points, each side of that signal, and will wait there for each other. This will only clear up if you have set your config so that trains will reverse after a while of waiting, in which event you have no jam but you also have at least one train heading in completely the wrong direction.

If the section is as short as that one pictured, they'll reverse into their previous block, but such a short track doesn't warrant this layout. Longer stretches will make trains proceed down the track parallel to the one on which they arrived.

edit: Actually, let me retract that statement completely. The signal in the middle is two signals, which would mean overlapping reservations. Yes, it works, and no, it doesn't deadlock. My mistake; should have engaged my brain as I looked.

[Gen.Sniper]

Try to place PBS on each end of the single track... I use them for long single track as overtaking and as help in heavy traffic....

PS: sorry for my worse english

[ostlandr]

Edit: Got it! Divided up a single track into three blocks with PBS:

McAlpine & Co., 23rd Apr 1929.png

one way track with 3 blocks

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The trick is to have the two signals in the middle face each other. Then a train waiting to enter the single track will wait until the leading train enters the more distant block before entering the first block. Once a train passes the second signal, it reserves a path past the junction, so no deadlocks.

Tried it with combo signals, but it caused deadlocks, and one train would not enter the single track until the other left, making the multiple blocks irrelevant.