The TNT Minecart is similar to a normal Minecart, but contains a block of TNT which blocks mobs and the players from riding in it. It will explode on these conditions: * It moves over a powered Activator Rail (after 4 second delay like the TNT block). * It derails and falls more than three blocks. * It's destroyed while in motion. * It's destroyed by fire, lava or an explosion. * It turns on a curved track with a solid block or entity located beside the track (in the previous movement direction).