In his demo video below he shows off a coffee table train he built 20 years ago using a rectangular layout under glass. ... But what happens to the N-scale train itself when gravity is reversed?

Built using smaller N gauge scale tracks instead of the more common HO scale so a longer train could wrap around the mountain, the layout pivots on a pair of skateboard bearings and is powered by ...

Like we said, [Peter]’s usual territory is hiding train layouts in end tables and coffee tables and the like, so it’s nice to see what he can do given different constraints.