The Activator Rail is a block that is used to activate TNT minecarts or Minecarts with Hopper. When given a redstone signal, they turn on and will activate 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 or the hopper minecart.