you can not drive a u turn with a minecart

you can not drive a u turn with a minecart

What I expected to happen was...:
I wanted to make a u turn with the minecart.

What actually happened was...:                                                                                          it bounced off the bend as if it were a block

Steps to Reproduce:
1. Build a u turn with the rails
2. place a minecart
3. drive around the bend