How to I add rotation to my roller coaster track in blender? I want to rotate my track to form different track elements in this dive coaster, but the curve won't allow me to add banking/rotation.I want to achieve this type of effect, where the track rotates around the curve.  

Here is my current set up. I can't complete this immelmann without banking the track out.
Select your curve, go into Edit mode. Select a control point, then press CTRL T to pivot the curve perpendicular to the curve path.