Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for minecart with tnt in Minecraft is shown below:
Items from earlier versions of Minecraft were assigned a numerical ID - a unique number to represent it.
The numerical ID for Minecart with TNT is:
The Minecart with TNT item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
Minecarts with TNT are, as the name would suggest, minecarts with TNT inside. They cannot take a passenger. They can obviously be.. DETONATED!