So You Want a Model Railroad (1955)

Alice visits Mr. Agony with her latest problem with Joe. They had given Junior a toy railroad for a Christmas present, and Joe had taken it over and become obsessed to the point he has built a railroad empire using all of his time, energy and money. When Alice's mother comes to dinner, Joe even has a rigged-up train serving as the dumb waiter. Mr. Agony helps Alice to solve her problem.