^^^Honestly, i looked for an example of trains in RPGs other than the phantom train and i could not find much, so i settled on the awesomeness that is Mother 2. I support this idea, but i think they really should be TRAINS. Aside from any story use, this is a vehicle you get on and ride for 15 minutes or something like that because you got on it to ride it. hang out, take a look at the passing scenery, do other stuff that's on the train. you can sit on things in this game, it would be pretty cool to sit on train seats.
Edit: also, pirates.