Some I don't think have been mentioned:
Back to the Future 3
The Sting
Continental Divide (John Belushi in one of his less pure comedic roles)
Atlas Shrugged (don't think the movies had a big following)
2 episodes of the original Twilight Zone:
1: the episdoe where the drunk department store santa wants to be the real santa. There is a Lionel layout in the opening department store scene and later when he's giving out gifts, a boy says he wants a train engine, santa asks steam or electric?, the boy says it doesn't matter, so santa hands him what looks like a brown lionel engine box
2: a couple wakes up alone in a deserted town where everything turns out to be fake, they keep hearing a child laugh. they get on a train which takes them to the same town, in the end it's revealed some giant alien has abducted them and brought them home for his alien child's toy train set (i guess lionel is sold in space)
Also I recall an episode of either "are you afraid of the dark" or "goosebumps" where the kid loves trains and meets a mysterious old railroad man who gives him an o gauge passenger car (think it was a lionel madison car). when he runs it on his layout the kid finds himself in the car on a train that is doomed to crash. he finds out the old man is the ghost of the conductor from this old train and he pulls the emergency brake to stop the train. it happens again, but the brake has been cut, so his brother saves the day by throwing the switch on an old stretech of track where the train had crashed years ago. I think that's what happened, i'll have to see if i can find it on youtube.