What you need: 13 stone blocks, powered rail, and 2 minecarts
How to do it: put 3 stone blocks on top of each other on the right side put 2 blocks down and put a third brick down on the right side of the other 2 blocks add 2 blocks on top of the third brick. Put 2 blocks on top of the 2 blocks you already put down. Put powered rail down where the 2 top blocks are. Put 2 minecarts on top of the powered rail and your finished