I was just doing an Aschaffenburg-Gemunden service on the MSB (DB BR 146.2) and left the train to add a route map to the board on the underground tunnel. Once I'd done it, I was unable to get back up the steps to return to the train. It would allow me to walk freely along the tunnel, but was unable to climb the stairs at either end. There was a pedestrian a couple of steps up on one of them which was not moving, but there would have been room to go around him. After a while, I got the notice asking if I wanted to give up control of the train, and had no other option but to do so. Anyone else run into this issue?