I have been told by a vice president in Imagineering what the mechanism is like. I found out after talking to him about the special effects and inner workings of Universal's The Mummy. The mechanism will not be a regular train switchback, that would be way too obvious. It will be a swith back where once you go up the track to the area where the camp is, at the top of the mountain, a small piece of track behind the car will move to the side and another pice will move in which is a turn to a seperate track. the two pieces will be on a convayor belt underneath them. It will either be a metal slide conveyor or a metal slide moved by hydralics. This is speculation but I feel it could be right because both of those ways would still provide support for the car in either position and be quiet enough that a rider would not be distrcted by it.