Minecraft wiki entry for Shelters, associated text: If you have enough resources, build a roller coaster out of rails. Add twists, turns, steep climbs and falls. Use booster rails to keep it running fast. This is a decent way to keep occupied while you have nothing else to do in the vast world of Minecraft. Useful in multiplayer - you can charge other players to ride. This could also be used as a monorail type of system. If you have a large base, this helps you get around it faster.