About 30 exemplars of the Kaelble Z 6 W a wheeled-tractor were delivered to the Luftwaffe in 1936/37. The vehicles were propelled by a 100 HP diesel engine. A cable winch with a pulling force of 4.5 tons was fitted to the rear of the vehicle.
This Kaelble wheeled-tractor is most probably a type Z 6 W a, too. It could also be a successor model because the driver’s cab on this vehicle was first introduced in 1938. The unit marking on the door could not be identified by now.