While doing a custom created scenario with the BR422 on Rapid Transit, when I open the doors at Leipzig Hbf Tief, the circle in the topleft corner of the screen doesn't fill. However, after a short while, the objective does get completed.
It happens with any train you put down there, all you have to do is release the doors and just wait about 30 seconds, it should just then auto complete that station stop, you can then continue. Jack.