The locomotives of the German DRG Class 81 were standard (Einheitsdampflokomotiven) goods train tank locomotives with the Deutsche Reichsbahn-Gesellschaft (DRG).

DRG Class 81
Model of a Class 81
Type and origin Power type Steam Builder Hanomag Serial number 10555…10564 Build date 1928 Total produced 10
Specifications Configuration: ​  • Whyte 0-8-0T  • UIC D h2t  • German Gt 44.17 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,100 mm (3 ft 7+1⁄4 in) Wheelbase: ​  • Axle spacing (Asymmetrical)  1,400 mm (4 ft 7+1⁄8 in) +  1,400 mm (4 ft 7+1⁄8 in) +  1,400 mm (4 ft 7+1⁄8 in) =  • Engine  4,200 mm (13 ft 9+3⁄8 in) Length: ​  • Over headstocks  9,780 mm (32 ft 1 in)  • Over buffers 11,080 mm (36 ft 4+1⁄4 in) Height  4,165 mm (13 ft 8 in) Axle load 16.9 t (16.6 long tons; 18.6 short tons) Adhesive weight 67.5 t (66.4 long tons; 74.4 short tons) Empty weight 52.0 t (51.2 long tons; 57.3 short tons) Service weight 67.5 t (66.4 long tons; 74.4 short tons) Fuel type Coal Fuel capacity 3.0 t (3.0 long tons; 3.3 short tons) Water cap. 8 m3 (1,760 imp gal; 2,110 US gal) Firebox: ​  • Grate area 1.78 m2 (19.2 sq ft) Boiler: ​  • Pitch 2,700 mm (8 ft 10+1⁄4 in)  • Tube plates 3,500 mm (11 ft 5+3⁄4 in)  • Small tubes  44.5 mm (1+3⁄4 in), 114 off  • Large tubes 118 mm (4+5⁄8 in), 32 off Boiler pressure 14 bar (14.3 kgf/cm2; 203 psi) Heating surface: ​  • Firebox  7.7 m2 (83 sq ft)  • Tubes 49.5 m2 (533 sq ft)  • Flues 38.7 m2 (417 sq ft)  • Total surface 95.9 m2 (1,032 sq ft) Superheater: ​  • Heating area 34.0 m2 (366 sq ft) Cylinders Two, outside Cylinder size 500 mm × 550 mm (19+11⁄16 in × 21+5⁄8 in) Loco brake einlösige Knorr compressed-air brakes, K-GP mZ auxiliary brake
Performance figures Maximum speed 45 km/h (28 mph) Indicated power 860 PS (633 kW; 848 hp)
Career Operators Deutsche Reichsbahn Numbers 81 001 – 81 010 Retired 1963

In 1928, ten examples were delivered by the firm of Hanomag that matched the Class 80 locomotives in many details. The axles were all fixed rigidly to the frame, but the middle one had thinner wheel flanges. In contrast to the Class 80s, the Class 81 engines had a larger heating area and carried more coal and water. The delivery of 60 more vehicles was cancelled in 1940 due to the Second World War. The locomotives were mainly employed on heavy shunting duties. After their collection, the ten engines were allocated to the locomotive depots (Bahnbetriebswerken or Bw) of Goslar (81 001–005) and Oldenburg (81 006–010). In 1945 all the engines were in the Oldenburg area and went over to the Deutsche Bundesbahn. The last engine was taken out of service in October 1963. Number 81 005 was still working as an industrial loco in AW Nied after its retirement from the DB.