Minecart with TNT

A Minecart with TNT is a planned vehicle to be added in the Redstone Update. Currently, it functions as a movable TNT block; with the use of a minecart. The TNT can be activated in a multitude of ways, including hitting an Activator Rail.

Usage
The Minecart with TNT entity acts as a movable TNT block, with the help of an empty minecart. The TNT block can be activated by either hitting an Activator Rail, falling off a cliff, hitting another entity while in motion, and hitting a dead end of rails.

Bugs

 * If pushed by the player, they will explode 4 seconds later (Without any TNT animation), however with the explosion animation.
 * If you force two carts together (so that they occupy the same space) and then force them both to explode, you'll get a long period of lag followed by either a Nuke like explosion or a crash on a slow computer. (Dinnerbone nicknamed this "Nuclear minecarts" )