We were watching (Netflix) "I was a Male War Bride" and there were a couple scenes with trains. Most interesting were a couple showing an temporary narrow gauge track setup for debris clearing from war destroyed buildings. The film was released in 1949 so there must have been plenty of authentic war damage. I will post a couple screen captures for educational purposes from the movie.
Charles
PS: Pete, maybe you can sneak in scene like the track next to a building rubble pile, on the side behind a panel dividing the scene from the rest of the layout. A kind of space warp to Germany.