If you get TNT carts, and just hold down when you place them on a rail, they will be doubled up in the same place. If you then push them, and they are about to fall off the edge, they will get stuck together, yet still continue gaining speed (You can tell from the sound). Furthermore, you can then destroy all the blocks under the connected rails, and the rails will float in mid-air. Eventually, the game will lag-out and crash, because of "ticking entities"
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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.
I had a Minecart with Furnace and Minecart with Chest on a 4x4 circle of powered rail. When I placed a Minecart with TNT between them, the furnace cart and TNT cart touched. Then all the carts stopped moving, even though the sound got progressively louder. I quickly started getting progressively longer lag spikes, until eventually the game simply froze. Luckily, MC-6834 prevented this bug from continuing on reload, since the TNT cart wasn't reloaded.
In Snapshot 13w02b, I created a slope of powered rail. At the top, a dispenser with all 9 slots having a Minecart with TNT. I put a Comparator facing facing it and a lever on the other side so it would rapid-fire Minecarts with TNT. I pulled the lever and it sent all nine carts down the track very close together. When the first got to the end of the track, after passing over an Activator Rail, the game slowed down immensely, progressively getting even slower, with all the carts stopped. Eventually, the game crashed with the error report I am submitting. Upon reloading the game, the game held on the dirt background of the menu for a moment while the sound of TNT going off was heard, followed by the world loading normally with a large hole where the carts were.
(X-post from MC-7194)
Made a video of this bug - http://www.youtube.com/watch?v=TK4ddR5iUEM
Dinnerbone, you must fix this. 2 pigs gave their lifes so this bug report could be made.
Nathan Adams
I also posted this bug: MC-6841 that when minecarts are doubled they start to move indepently. Hopes to get fixed!