This has happened twice now. AI train is stuck at Wiesthal station, once without a driver and the second time with driver in T-pose. Because of this all the trains seems stuck at red (including my train).
Happened to me as well I flew up to the train at the station and opened all the doors then closed all of them. Then the AI train moved on with out issue.
So when your in your train press the 8 key and that will get outside your train, by using the arrow keys and mouse and shift key for speed. You can fly up to the train in the station and stand in front of doors and you can open them up.
A patch went out yesterday- this SHOULD be fixed. A bit worrying if it's still there. Maybe try it again?
Funny because I ran it a second time before the patch was released and the train was not there, it had moved on to the next station.
There's a lot wrong with this route, the spawn walking points are all over the place. The services in the early morning aren't right either and there's a couple with the trains not being there. I gave up on a service due to SIFA bug problems.