The articulated B V was a four-coupled locomotive built by
Maffei at their own expense. It was based on the
Class B V but, instead of having a third
coupled axle, the back of the engine was supported by the front of the
tender, called in German a Stütztender or "supporting tender". This was similar to the earlier
Engerth design which articulated the tender with the main
locomotive frame, allowing some of the weight of the fuel and water to be carried on the
driving wheels to improve adhesion. Because the tender was articulated, rather than directly attached to the frame, the locomotive could traverse relatively sharp curves, while still enjoying the advantage of the additional
adhesive weight gain. The articulated B V was not a success; its riding qualities were poor and only one example was produced.