The Zwickau Model sees lightweight diesel TrainTrams (also known as RegioSprinters) being extended from the mainline railway through urban streets just like regular trams (streetcars) - albeit although they are used within the street environment and even (for a short distance) over part of a pedestrianised zone they are always segregated from the normal road traffic. These TrainTrams are operated by the VogtlandBahn railway. Because the trams are metre gauge and the trains are standard gauge so where the trams and trains share tracks they use a three rail system featuring one shared rail and one exclusive rail each.