Driving the class 377 from London Victory southward (departure 22:14), the game crashed. I resumed a saved game. Then in Haywards heath I had to uncouple four wagons. The first next signal showed stop. Three trains were stacked up and then I saw a train that could have proceeded, but it did not. Probably this is a game save issue. It's annoying there is no way to force the game to recalculate all states.
Save games are broken across TSW. It's not unusual, in fact probable, that the signals and AI traffic will be all screwed up when restoring a save.