The Deutsche Reichsbahn had a standard passenger train tank engine with a wheel arrangement of 1′C1′ (UIC classification) or 2-6-2 (Whyte notation) and a low axle load, which was designated in their classification system as the DRG Class 64 (Baureihe 64).

The boiler and elements of the driving gear were the same as those on the DRG Class 24.

The Class 64 engine was given the nickname "Bubikopf" ('bob') after a fashionable ladies hairstyle of the time.

64 311 remained in Austria after 1945 and became class 64 (Reihe 64) with the Austrian Federal Railways (Österreichische Bundesbahnen or ÖBB).

Twenty Class 64 locomotives have been preserved, the majority in Germany.