A "Norwegian Loop" almost looks like a pretzel when viewed from the side. Trains start at the top of the element, do a half twist so they are inverted, then go through a loop. After diving down to ground level, they arrive inverted again at the top of the loop. Another half twist brings the train upright.
The first "Norwegian Loop" was on the Speed Monster at TusenFryd near Oslo, Norway.
©2014 by Joel A. Rogers