Must be a luxury round the country train, like a cruise ship. That would be pretty amazing if there were actually hotel style rooms and the likes inside the train. Think of how amazing it is to be able to live in a Hotel-like train for a few weeks or months while being able to watch the world move around you as you get to whatever destination it is you're going to.
Well, I guess for those that have motion sickness it might not be that great and it'll probably cost just as much as a cruise. But it would be one hell of an experience.