PBS lag time

YouTube · Post by **Geo Ghost** » 22 May 2005 11:01

ok, new error i think.
The new PBS signals on the neew patch have a lag time when changing colour after a train has gone over it.
it apears that 2 of my trains approached two different signals almost at the same time (give or take a couple of milli-seconds) and they both went through them and bang, collision.
Is this 'Lag time' with the signals deliberate, or a little problem.
Posted a pic below to show where it happens.

Alfasmurf · Post by **Alfasmurf** » 22 May 2005 15:21

i experienced the same thing.. two trains arrived at the same station from opposite ends.. they're both let in, and bang..

Post by **PikkaBird** » 22 May 2005 15:37

Geo.c Ghost wrote:ok, new error i think.
The new PBS signals on the neew patch have a lag time when changing colour after a train has gone over it.

I think the problem you have there is the waypoint. The train which is going through the waypoint is let through the signal because there is a clear path to its destination.

Flamelord · Post by **Flamelord** » 22 May 2005 15:46

And don't keep depots in PBS blocks, my trains always crash when I have depots in the PBS blocks. Meh, Pikka's probably right about the cause for you, so whatever.

YouTube · Post by **Geo Ghost** » 22 May 2005 16:32

PikkaBird wrote:
Geo.c Ghost wrote:ok, new error i think.
The new PBS signals on the neew patch have a lag time when changing colour after a train has gone over it.
I think the problem you have there is the waypoint. The train which is going through the waypoint is let through the signal because there is a clear path to its destination.

i did wonder that, but it seems to be doing it everywhere. regardless if theres a waypoint there or not

Patchman · Post by **Patchman** » 22 May 2005 16:53

Since you didn't post the savegame (tsk tsk), I can't test it, but I'm pretty sure it happens because of the waypoint. You need to change it so that you have a signal on both sides of it to be safe.

YouTube · Post by **Geo Ghost** » 22 May 2005 18:06

Patchman wrote:Since you didn't post the savegame (tsk tsk), I can't test it, but I'm pretty sure it happens because of the waypoint. You need to change it so that you have a signal on both sides of it to be safe.

Apologise, it appears it must have been the waypoint, because deleteing it, changing the order, or putting a signal after it seems to work. sorry, i thought i had tried that, i obviously hadnt

The Person · Post by **The Person** » 23 May 2005 06:26

The way I've understood it PBS signals where a train is passing don't go green before the train has passed. But maybe that's just me thinking that's how it is as PBS signals in my games always work that way, waypoint or not.

DaleStan · Post by **DaleStan** » 23 May 2005 06:41

The signal the train is *passing* stays green. The other block-entrance signals go red.

The Person · Post by **The Person** » 23 May 2005 11:44

That was what I was trying to say in much clearer words. I've always thought it was how PBS is supposed to act.

krtaylor · Post by **krtaylor** » 23 May 2005 16:13

So, in other words, do NOT put checkpoints or depots inside of PBS blocks. Right?

YouTube · Post by **Geo Ghost** » 23 May 2005 16:54

erm...
yes!

Siema · Post by **Siema** » 23 May 2005 16:58

Hmm... I place depots in PBS blocks very often and there are no crashes. They appears when there is signal-box or bridge (I don't know if tunnel also) in PBS block. But who knows, maybye depots also causes collisions...

Post by **PikkaBird** » 23 May 2005 17:16

Siema wrote:Hmm... I place depots in PBS blocks very often and there are no crashes. They appears when there is signal-box or bridge (I don't know if tunnel also) in PBS block. But who knows, maybye depots also causes collisions...

I haven't seen any problems with bridges. I have seen problems with depots, stations and waypoints, but I don't believe it's a bug, I believe it's acting as intended.

Take the common layout below - a double track coming into a single-track terminus station, with depot.

Train 1 comes into the station.
Train 2 arrives at the signal. The pathfinding sees a clear path into the depot and lets it through.
Train 1 finishes loading, leaves the station, and BOOM, thumps straight into the train entering the depot.

Now, how do we fix this layout? By placing a signal between the depot and the station (if we make it a presig exit, and make the signal from the double track a presig entrance, then trains wanting to enter the station will wait there until the station is vacant).

So the rule is... a pbs block must not contain a station (or waypoint), unless that station is the only possible destination in the block.

krtaylor · Post by **krtaylor** » 23 May 2005 17:55

There are routing problems with bridges, but I've not seen one cause a crash.

Siema · Post by **Siema** » 23 May 2005 19:15

I'm not using situation that you described (before fixing), PikkaBird because I find it as mistake and I'm not suprised that this situation causes problems

But as I said I'm using depots in closed PBS blocks and there are no accidents.

There are routing problems with bridges, but I've not seen one cause a crash.

I have got one, but I haven't seen it also because I wasn't there and after crash I have started to clear this mess and forgot to check what it exactly was (bridge for sure)

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