This type of steam locomotive was the strongest tender locomotive ever procured by the
Deutsche Reichsbahn-Gesellschaft. In total, 45 examples of this gigantic machine were
built. Its nickname 'Bergkönigin' (mountain queen) was the result of its predominant use
on lines such as the Sonneberg-Probstzella, the Spessart Ramp, the Franconian Forest
Railway, the Geislinger Steige, the Schiefe Ebene and the Rübeland Railway.