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The game crashed with the below error when a train crashed in to another train.

Error Rail.cpp:164: this->state == RailConnectionDirection::None was not true

I am using modded short trains. I loaded a test save game, placed a new train (3 wagons) in paused editor mode on a track a bit ahead of an existing moving train and then ran the game for a few seconds. It looked to be upon the collision the game crashed.
I have tried to reproduce the issue from the save a few times with the same sort of new train placement, but aren't able to.

Ref 88396 (or duplicate?)

yea it looks the same type of circumstances and error message. Hard as I can't reproduce with my 1 stationary and 1 moving train.
sorry my search skills obviously failed.

Lets assume it is a duplicate.