slick204 wrote:Don't spend a lot of time. It's probably because I ran it so slow. I was during the last instruction, heading back to park the locomotive.
I can tell you the train number and siding if that would help.

Running a scenario that I created but haven't looked at for a while is always a bit strange, but I finished it, reaching Engine Shed 2 at 09:56. As I approached the shed, AI train BM1792 was driving north just beyond the yard to the west and that may be the train that caused a crash -- but it shouldn't, because its final destination is a short siding at the north-west end of the auxiliary yard tracks -- those across the main tracks from the yard itself. It does pass one track away from some cars, but does not approach them at all -- well, perhaps I should say should not rather than does not. There's no other AI engine picking up or dropping off around that time, so I'm completely bamboozled. All I can say is that TS's AI "dispatcher" sometimes has a mind of its own.
Running this scenario very slowly is likely to cause you to miss seeing some of the AI movements, but BM1792 is the last AI in the scenario and . . . well, there's nothing more that I can say. Perhaps you could try the scenario again, but since you came very close to completion, there's no real reason to do so -- or are you a green check mark enthusiast?
Sorry I couldn't help.