DRG Class 81

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DRG Class 81
Model of a Class 81
Number(s)DRG 81 001–010
Year(s) of manufacture1928
Wheel arrangement0-8-0T
Axle arrangementD h2t
TypeGt 44.17
Track gauge1,435 mm (4 ft 8 12 in)
Length over buffers11,080 mm (36 ft 4 14 in)
Height4,165 mm (13 ft 8 in)
Overall wheelbase4,200 mm (13 ft 9 14 in)
Empty weight42.0 tonnes (41.3 long tons; 46.3 short tons)
Service weight67.5 tonnes (66.4 long tons; 74.4 short tons)
Adhesive weight67.5 tonnes (66.4 long tons; 74.4 short tons)
Axle load16.9 tonnes (16.6 long tons; 18.6 short tons)
Top speed45 km/h (28 mph)
Indicated Power633 kW (861 PS; 849 hp)
Driving wheel diameter1,100 mm (3 ft 7 14 in)
No. of cylinders2
Cylinder bore500 mm (19 913 in)
Piston stroke550 mm (21 58 in)
Boiler Overpressure14 bar (1.40 MPa; 203 psi)
No. of heating tubes114
No. of smoke tubes32
Heating tube length3,500 mm (11 ft 5 34 in)
Grate area1.82 m2 (19.6 sq ft)
Radiative heating area7.7 m2 (83 sq ft)
Tube heating area
  • Tubes: 49.51 m2 (532.9 sq ft)
  • Flues: 38.70 m2 (416.6 sq ft)
Superheater area34.00 m2 (366.0 sq ft)
Evaporative heating area95.91 m2 (1,032.4 sq ft)
Water capacity8 m3 (280 cu ft) or 8,000 litres (1,800 imp gal; 2,100 US gal)
FuelCoal: 3 tonnes (3.0 long tons; 3.3 short tons)
Brakeseinlösige Knorr compressed-air brakes, K-GP mZ auxiliary brake

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

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.

Preserved locomotives[edit]

Number 81 004 is the only one of its type to have been preserved. After passing through several owners and locations, it has found a home with the Hessencourrier society, who intend to have it refurbished.

See also[edit]