I was recently watching this movie the other day and realized the train scene is a feet goldmine. I know it's tame by today's standards but if you had a foot fetish in the 1950s you probably went to see this movie a hundred times! It takes a couple minutes for the scene to heat up.
You have to be careful with this one; both Jack Lemmon and Tony Curtis are both dressed as women in this scene. I kept wondering why that first "woman" with Marilyn was so fugly.