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Two identical sets of trains, shared timetable, offset start times, increasing difference in distance between trains

Posted: 13 Feb 2019 22:16
by Seph
Ok, so this might get a bit long-winded. Sorry in advance. I'm trying to set up a super tight, tokaido shinkansen-like train line. This means managing departures down to the tick in order to squeeze as many different services onto the tracks as possible. I set out to do this by first constructing a test train, and have it timetable the entire track. I then added some extra wait time at stations as a buffer, made forty-four copies of it, retired the original, and started launching the trains from a single depot. I did this in order to try and make sure that the time between each train was exactly the same. Once they had all entered service, I made another forty-four copies with the same shared timetable, and started sending them out from a neighboring depot, with their own platform. I offset their launch time slightly by waiting to activate the trains in the depot at just the right moment, so that they run as close to the previous departure as possible, without ever encountering any slowdown.

This works fine for the first 10-20 trains. However, once I got into the low thirties, it became very apparent that the gap between the two supposedly identical groups was growing. It is not due to their departure times being too close. Believe me, I've spent way too long taring at the trains leaving the station, trying to figure out what's wrong. This has completely killed my will to play. I've spent hours and hours trying to come up with some explanation, to no avail.

Have I stumbled upon a bug in the way OpenTTD keeps track of the trains? Or is there some natural explanation.

Here are the timetables(https://imgur.com/7m7awbr), a short video of the first pair of trains leaving the station(https://youtu.be/TWYxSxjuMs8), the last pair of trains(https://youtu.be/aEmlLA9kh5s), the launch of the first set of trains(https://youtu.be/PcAGjkTzEZo), and the second set of trains(https://youtu.be/ZIj5V7V2doc).

Help me TT-Forums, you are my only hope!!

EDIT:

I'm using version 1.8.0. You will find the savegame where I am about to launch the second set attached.

Re: Two identical sets of trains, shared timetable, offset start times, increasing difference in distance between trains

Posted: 13 Feb 2019 22:30
by planetmaker
You forgot to attach a savegame and to mention which OpenTTD version you play with :)

Re: Two identical sets of trains, shared timetable, offset start times, increasing difference in distance between trains

Posted: 13 Feb 2019 23:59
by Seph
planetmaker wrote:You forgot to attach a savegame and to mention which OpenTTD version you play with :)
Sorry, fixed.

Re: Two identical sets of trains, shared timetable, offset start times, increasing difference in distance between trains

Posted: 19 Feb 2019 13:07
by Seph
Has anyone had the time to take a look at this? Could I be looking at a bug?

Re: Two identical sets of trains, shared timetable, offset start times, increasing difference in distance between trains

Posted: 02 Apr 2019 01:33
by gGeorg
Seph wrote:Has anyone had the time to take a look at this? Could I be looking at a bug?
Hello,
impressive city build. How big is it? Would you post some overview of your creation?

Regarding your issue, when you released all the trains, do you press in the TimeTable dialog Ctrl+"Start date"?
That command spread start date of all timetables in time, so trains space out evenly. No gaps, guaranteed. In fact, you don't need release trains manually to create spacing, rather release them at once then press Ctrl+"Start date" then let them fallow rules so they space out by themselves. :wink: