I believe "Emperor of the North Pole" was a hobo term for "Head Honcho". That explains where the original title for the movie "Emperor of the North" came from. In "Polar Express" the hobo character refers to Santa as the Emperor of the North Pole, in which the phrase takes on two meanings. I love both those movies by the way. I need to get "Emperor of the North" on DVD. I also like "Harvey Girls" though its been years since I've seen it and I don't recall how much in the way of actual train footage there is. That's another one I need to find on DVD. It has Judy Garland singin' in the train instead of the rain.