Giving priority to trains when entering a junction

[Sir A. Boey]

Hello,

I'm wondering if you couldn't give a priority to a certain line or a certain group of trains when they enter a junction with an other group of trains or a different line.

I'm aware that there are a lot of players who combine their cargo on one train and that this might be a problem to how one might code such a patch.

My first thought was to give (for example) a passenger train priority to a train with coal or a line which is used more often than the other line in the junction.

This could solve a big queue in the mainline (when using junctions)
In my attachment you can see a massive junction with a lot of lines,
I've been testing this junction with 160 Maglev's and in the 15 years that it has run there never was a queue but there could be a better flow on the most used line (if there would be one-which is not the case in my test game). If you could give a priority to one line then you could have a better flow of that line.

[Sir A. Boey]

The newer version of the junction because in the first screenshot I've had some queues then modivied it and never had any queues anymore.

[JGR]

You may wish to investigate #openttdcoop, or look around in General OpenTTD for some of the priority layout type discussions...
I'm sure if you do a forum search for priority you'll get some ideas.
Most schemes use presignals and/or bits of track between signal blocks, for purely signal propagation purposes...

JGR

PS.
This is the TTDP section, that is in OTTD screenshot, which uses various features not in the Patch.
To be honest, most of the enormous multi-level junctions happen in the openttd section, so in general you are better off posting it there.
Don't duplicate your post however, but next time it would be better in OTTD section.
(A mod might move it still...)

[Sir A. Boey]

oeps wrong section sorry

[Stevie D]

I'm wondering if you couldn't give a priority to a certain line or a certain group of trains when they enter a junction with an other group of trains or a different line.

It's quite easy to give priority to trains on one line over another, by using presignals.

See the piccy showing the freight train on the mainline holding the signals at red for the passenger train on the branch line.

priority-junction.png (33.53 KiB) Viewed 5265 times

Put a one-way pre-signal entrance on the line that you want to give way. Put a normal one-way signal on the exit from the junction. Now - and here's the clever bit (and it wasn't me that thought of it) - put a two-way presignal exit on the line that you want to have priority.

This means that a train on the branch line will look for a green exit signal from the block. If the exit signal is green (regardless of the fact that the train can't go that way and will leave past a different signal), it gets a green light ... but if the exit signal is red (ie, there is a mainline train approaching), the branch line train will be held at red until the main line is clear.

[Sir A. Boey]

What a fabulous Idea

That's the solution to my question ty very very very much, I never tought
about this solution

Thanks

[aahz77]

If you didn't know this neat little trick, you may want to have a look at a very good signalling guide.

[Raichase]

If you didn't know this neat little trick, you may want to have a look at a very good signalling guide.

Haha, beat me to it. I too can second Uwes fabulous signalling guide - no matter how good at TT you consider yourself, you can always learn something new there .

Good luck (if you still want your thread moved to OTTD section, drop us a line).

[Sir A. Boey]

Iff that's possible please do so because I want as many pointers
as I can to make a very succesfull network with special junctions and signals

thanks the tutural seems quite interesting

[Raichase]

Moved for you .

I think you'll find the OTTD folks just as helpful, and probably more knowledgable!

Good luck