Minecraft wiki entry for Minecart_with_TNT, associated text: Upon detonation it acts as normal TNT, exploding and damaging nearby blocks, players, and entities. Upon detonation after activating on activator rail, it does not destroy its rails and the blocks the rail is on, however other nearby carts can.‌[Java Edition only] More than one minecart can be placed on the same rail block, allowing many of them to fit into a single block. They explode when touched, dealing large amounts of damage.