Move Rigidbody along curve

Hi, I've been stuck on this for a little while now. I have made a curve in my scene, and I have 50 locations along the curve. The thing I want to achieve is that my Rigidbody GameObject moves along this curve. I could set the Rigidbody location to the next location on the curve, but how would I move it along the curve with a certain speed? ![alt text][1] [1]: /storage/temp/109765-screenshot-1.png