356.801 Error MainLoop.cpp:1435: Exception at tick 295750427: The mod Rivens Realistic Train Acceleration (0.1.25) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TrainSpeeds::on_tick (ID 0)
Trying to change direction of automatic train moving on a path.
stack traceback:
[C]: in function 'newindex'
__TrainSpeeds/control.lua:46: in function 'apply_speed'
TrainSpeeds/control.lua:256: in function 'get_trains'
TrainSpeeds/control.lua:287: in function <TrainSpeeds/control.lua:272>
356.802 Error ServerMultiplayerManager.cpp:84: MultiplayerManager failed: "The mod Rivens Realistic Train Acceleration (0.1.25) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TrainSpeeds::on_tick (ID 0)
Trying to change direction of automatic train moving on a path.
stack traceback:
[C]: in function 'newindex'
__TrainSpeeds/control.lua:46: in function 'apply_speed'
TrainSpeeds/control.lua:256: in function 'get_trains'
TrainSpeeds/control.lua:287: in function <TrainSpeeds/control.lua:272>"
356.802 Info ServerMultiplayerManager.cpp:806: updateTick(295750427) changing state from(InGame) to(Failed)
356.805 Quitting: multiplayer error.

Very odd, I actually have code that (supposedly) makes this impossible. Are you using trains that have locomotives oriented in both directions?

Do you have other mods installed?

Yes i have double sided Locomotives and also use Electric Trains (https://mods.factorio.com/mod/ElectricTrains)

James' Electric Trains Plus (https://mods.factorio.com/mod/James-Train-Mod) is only installed but not in use right now.

It works fine with the fork (https://mods.factorio.com/mod/CargoWeight) but would like to go back to the original.

Interestingly, I cannot reproduce it. Does the crash happen immediately, or does it take minutes or hours before it happens?

I have added some code that should reduce the odds, and made the 0.1.26 release, but... the code should really make it impossible already. At the beginning of each tick I note the speed of the train, and when adjusting the train-speed I already check whether it is in the same direction as the original direction. I added some margin, for very slow moving trains, to just 'leave it alone' ^_^

If you have a save-game that shows the crash, I'd be grateful if you could share it.

Also, I made the electric trains more realistic as well - they still accelerate faster than the default locomotives, but not by as much.

Usual it crashed few seconds after it loaded 1-3sec.
The update fixed it for me. I had no crash. Only difference i noticed on my side is, all my trains was all in stations this time and not moving while i changed the mod. Anyway it works now :) Thank you very much! Love this mod <3

I think I found it... there is this pesky difference between +0.00 and -0.00 ...stares into the void