Four's a Crowd" is a romantic comedy made in 1938 starring Errol Flynn, Olivia de Havilland, Rosalind Russell and Patrick Knowles with Walter Connelly as a rich old man who loves trains. The trains play a prominent role in the plot and I found a 13+ minute clip that has all the train parts of the movie. This wasn't a terribly successful movie and I haven't seen it on TV since the '70s. I thought you might enjoy this so here it is: