If you use only two carts or so you'll notice their is an explosion followed by the lag. However in my testing McEdit is required to remove all of the dropped items to actually see the effect. I've provided two screenshots from McEdit of the effects (titled double_tntcart_effect etc.). Using three carts my client simply crashes. NOTE: I was only using two, I got the effect when pushing them OFF a rail.
Huntard
If you use only two carts or so you'll notice their is an explosion followed by the lag. However in my testing McEdit is required to remove all of the dropped items to actually see the effect. I've provided two screenshots from McEdit of the effects (titled double_tntcart_effect etc.). Using three carts my client simply crashes. NOTE: I was only using two, I got the effect when pushing them OFF a rail.