Activator Rail

The Activator Rail is a block that is used to activate TNT minecarts. When given a redstone signal, they turn on and will active any cart that goes over them. When off, they act as normal rails. They pass power in the same way as powered rails do. Activator rails do not accelerate minecarts, or affect any besides the TNT minecart. It is not unlikely that in the future they will be used to activate dispenser minecarts as well.