Prototype: ROBEL track car based on the type 54.20 of the firm Leonhard Weiss, Göppingen. With movable loading crane. Used for maintenance and inspection. Golden yellow basic colour scheme. State of operation as of 2020.

Model: The locomotive has an mfx+ digital decoder and extensive sound functions. Controlled high-efficiency propulsion. Maintenance-free motor in a compact design. 2 axles powered. Attached grab irons on the driver's cab. The three-light headlights and two red marker lights change over with the direction of travel, will work in conventional operation, and can be controlled digitally. The headlights on locomotive ends 1 and 2 can be turned off separately in digital operation. Double A light function. Maintenance-free warm white and red LEDs are used for the lighting. The engineer's cab has furnishings and switchable interior lighting. The loading crane can be motorised and digitally controlled.

Length over the buffers 13.4 cm.

The ideal addition for the two-way Unimog of the company Leonhard Weiss, which is exclusively available in the shop of the märklineum in Göppingen under the item number 39942. This product was developed in cooperation with the company Viessmann Modelltechnik GmbH.