1. Please describe as detailed as possible what you did and which problem that leads to.
While the map is loading, after the first icon lights up, the simulation is running. This means that the train can be controlled and move while the world is not visible to the user.
Problem can be seen and heard in this video:
2. Please post your logfile and if possible attach your debug logfile, as well, which have been created during the problem occured.
Problem is best illustrated with the video, normal logfile is attached