Between 1950 and 1952, LKM at Babelsberg built 21 0-8-0T tank locomotives for a gauge of 900 mm. They were mainly intended for customers in the industry, like Wismut and for lignite mining. For ease of maintenance, they had no superheater and additionally, they were designed for the firing of lignite. Due to the small drivers and long overhangs, top speed was limited to 35 km/h or 22 mph. Despite this, three were bought by the Reichsbahn in 1958 for use on the Molli railway that connects Bad Doberan to the sea spa of Kühlungsborn. They became class 9933. Two of these were superheated in 1961 and one is still operational and used in times of high demand. 