Functional model for two-wire systems. This model impresses through an especially developed and patented underfloor drive, which is adapted to the flat design of this track construction vehicle and offers very stable driving properties. A further special feature is the movable working crane, which can be swiveled without limitation both to the right and to the left by motor. The crane arm rises from the loading surface and then lowers next to the track. When driving slowly, in operation with sound, digital and analogueue, the ROBEL convinces on the whole line. The vehicle is versatile and belongs to every model system.This text is machine translated.