I'm trying to create a clothoid loop for a roller coaster. So far, I have a track with no curvature, and that problem with it is that the track will intersect itself.

To fix this, I need to add a curvature to the track that would translate the track to the side, but I don't know how to do that. 

I have attached the part of the track that will need the curvature below, which is basically the top portion of the loop.