[Game Idea for a Travel Session] A Magical Train, with a Wagon themed on Every Universe It Went In

For Every Place the Train Went, A wagon is made, so it starts with your players entering a Wagon that looks like their City, Then as they move in it, they discover Fun universe you and your player like, Transforming the Travel episode in a Memorable One-Off where they live new things, and a small DM challenge, and when the...