The three engines of DRG Class 99.22 were standard, narrow gauge locomotives (Einheitsloks) in service with the German Reichsbahn.

In 1944, during the course of the Second World War, locomotives 99 221 and 99 223 went to the Thamshavnbanen copper ore line in Norway.

Locomotive 99 222 remained on duty until 1966 on its original route, but when it became clear that the end was nigh, it transferred to the Harz and is in service today on the network of the Harz Narrow Gauge Railways (Harzer Schmalspurbahnen or HSB) between Nordhausen, Quedlinburg and Wernigerode.

The Class 99.22 is the most powerful of the German narrow gauge steam locomotives and had Bissel axles.

After its transfer to the Harzquerbahn, 99 222 was converted to the normal compensating coupling with central buffer.