Animated movie about a train on a cliff?!?!?!

Hello!! Please help me figure out this movie!! IT IS DRIVING ME CRAZY.

This is an animated movie or part of a kids show with a train chugging along a cliff. The only other thing i can remember is that the train went into a canyon of some sort and was on a ledge. There may have been characters in the train, too. That may not have been the whole movie, because I do not remember much. I saw it late 90’s early 2000’s. It is not the polar express, or the little engine that could. I don’t know what else it could be. Please help! I would love to watch it again.

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