This limit switch is responsible for deactivation for the longitudinal travel motor. This usually reacts only shortly before the buffer (2-3 cm), which currently consists of a pneumatic cylinder. This cylinder is attached to the RBG itself. This hardware limit switch is present on both sides of the RBG for the longitudinal travel motor. The same hardware limit switch also exists for the lifting motor. In this case, the sensors are located at the top and bottom end of the RBG.