I sometimes face issues on various routes whereby when I reach the end of the player service, the example I'm going to use is BML 1P22 10:39 Purley to East Croyden, the service completes and an AI driver appears, in the cab, closes the doors but then the train won't go anywhere. I started service mode on foot at Purley and took over the service after it joined. I experience this issue on several services and routes but I'm yet to work out what's causing it. It's very annoying though as it ends up locking the route up eventually, by blocking the platform/end point.