This blog post will show you how to craft a Minecart with a chest that is used to transport items on a rail.
This blog post will show you how to craft a Minecart with Furnace which can propel itself on tracks.
This blog post will show you how to craft a Minecart with Hopper, which is used to drop or retrieve items.
This blog post will show you how to craft a Minecart with TNT, which can blow up after a delay.