Minecarts stop on end of track.

I have already found the cause. The minecart track does not cover a whole block. The edge of a rail stops just a pixel away from the edge of a block. The minecart falls off the track, but is stopped by the friction of the block.

Also, the edges of a minecart do not have any collision layers. So even if the rail is cover the whole block, the minecart falls of rail before it can reach a near death.

Working as intended.

You can use Soul Sand to have the cart fall down a cliff.

Wouldn't this fit better as a duplicate than "is cloned by"?