Minecraft wiki entry for Trapdoor_uses, associated text: It is also possible to create a minecart launching pad by placing two trapdoors side by side. Now connect the trapdoors with a button/lever and one redstone wire. Then build 2 ramps with minecart tracks. One should lead to your launch pad and the second one should be built under your trapdoors. If you build 2 minecart launching pads side by side, it would allow you to create a minecart racetrack. Just put your minecart on the top of the upper ramp, enter it and wait until you're on the trapdoor and press the button to start.