...A giant metal construct that moves along a designated path laid out by rails that helps hasten the transportation of passengers or goods, originally steam powered but currently more commonly powered by electricity.

[...] It's a giant metal room on wheels with a bunch of chairs that helps people get from one town, city, or even region faster than by walking or riding a Pokémon. ...Or animal. [Ingo why did you fill his head with a bunch of knowledge on trains]