Derailment is impossible. It is possible to squeeze the top of the rail in order to make an emergency braking. This way it is possible under all circumstances to brake in a very short time. Short safety distances means large capacity.
Energy consumption is very low due to the close coupling of vehicles to form a train.
This principle also increases safety, since collisions within the train are eliminated when the vehicles already touch each other. The rufs are electric vehicles with small batteries. The batteries are partly recharged while the ruf uses the rail.