Pistons can "pull" minecart through ground

Pistons can pull minecarts through the ground.

See what it is here: http://youtu.be/Bca8oAGliRM

Edit: World taken down as of September 21st, 2014. Just see the video.

If you need more info, just reply.

It's a really cool bug, and it would be great in "train stations", so I honestly hope you leave it