A Small Locomotive for Big Jobs. The best known small locomotive and at the same time the diesel locomotive built in the largest numbers in Germany was the Köf II, the diesel hydraulic small locomotive with about 125 hp performance. These locomotives were authorized for speeds of 30 to 50 km/h / 19 to 31 mph, depending on the brake system. The DB bought around 800 new locomotives of this type in addition to the approximately 1,000 units built in the Forties. The DB had 1,100 units in service around 1976, which had been re-classed in the intervening period as the 322, 323, and 324. Approximately 250 Kö II and Köf II units worked on the DR in East Germany as the class 100.1 and 100.8, and became the class 310 on the DB AG. In addition to the small locomotives on the roster of the state railroad, a large number of additional units, which were delivered directly to privately owned railroads and to industrial plants both domestically and in other countries, brings the estimated total number of Köf II and its siblings to 2,500 units. Many of these proven small locomotives are still in used as second hand motive power.