Garfield the Movie has a model train scene in it.An episode of Dukes of Hazzard has a model train scene in it with a signal.So does Gumby.Will someone sticky this thread also?I guess that covers trains and signals,real and model,in the media.
in the Simpsons, Rev. Lovejoy has a model train setup and Ned Flanders calls him when he is running them and during the call they crash. Later in the episode it shows some workers bringing in a table with tracks and other landscape, when Homer busts through it in his car and it breaks. Rev. Lovejoy then turns to the sky and says "why does everybody hate my trains?"
In Tom & Jerry,the episode about a canary,in the end,Tom ties Jerry to the model train track and attempts to run him over with the train,but the canary drops a bowling ball on the track and puts a hole on the floor and the train goes into the hole.Also that scene is in the episode Life with Tom.