Twisted Colossus
Even though trains are held upside-down for a while on the green track, it is a very smooth and pleasurable feeling.  The parabolic arc and rolling inversion were carefully designed so riders aren't subjected to negative g-forces.  I am convinced that if your eyes were closed during the "Top Gun Stall," you wouldn't even know you were turned upside-down... it just feels like you float for a few seconds.

During the second lap around the course, the blue hill provides a nice portion of airtime as the trains crest the hill placed under the inversion.

©2017 Joel A. Rogers.