Abstract: A trackless, center-pivot underground vehicle is described, which has a tractor section, which is driven by an electric motor, which is powered via a sliding contact line, a current collector device, which is movable along the contact line line, and a supply cable, which is electrically and mechanically connected to the current collector device and adapted to be unwound from a reel against a restoring force. An improved mobility of the vehicle and a large width range throughout the range of travel are ensured by the combination of the following features:a. the supply cable is connected to the current collector device by a slip ring member, which is rotatable about a vertical axle;b. a helically winding cable reel is mounted on the tractor section and rotatable about a vertical axle, which is provided with a slip ring member;c. a guide arm is coaxially arranged with respect to the cable reel and adapted to be pivotally movable by hydraulic means; andd.