DRG Class 81
| DRG Class 81 | |
|---|---|
 Model of a Class 81 | |
| Number(s) | DRG 81 001–010 |
| Quantity | 10 |
| Manufacturer | Hanomag |
| Year(s) of manufacture | 1928 |
| Retired | 1963 |
| Wheel arrangement | 0-8-0T |
| Axle arrangement | D h2t |
| Type | Gt 44.17 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Length over buffers | 11,080 mm (36 ft 4 1⁄4 in) |
| Height | 4,165 mm (13 ft 8 in) |
| Overall wheelbase | 4,200 mm (13 ft 9 1⁄4 in) |
| Empty weight | 42.0 tonnes (41.3 long tons; 46.3 short tons) |
| Service weight | 67.5 tonnes (66.4 long tons; 74.4 short tons) |
| Adhesive weight | 67.5 tonnes (66.4 long tons; 74.4 short tons) |
| Axle load | 16.9 tonnes (16.6 long tons; 18.6 short tons) |
| Top speed | 45 km/h (28 mph) |
| Indicated Power | 633 kW (861 PS; 849 hp) |
| Driving wheel diameter | 1,100 mm (3 ft 7 1⁄4 in) |
| No. of cylinders | 2 |
| Cylinder bore | 500 mm (19 9⁄13 in) |
| Piston stroke | 550 mm (21 5⁄8 in) |
| Boiler Overpressure | 14 bar (1.40 MPa; 203 psi) |
| No. of heating tubes | 114 |
| No. of smoke tubes | 32 |
| Heating tube length | 3,500 mm (11 ft 5 3⁄4 in) |
| Grate area | 1.82 m2 (19.6 sq ft) |
| Radiative heating area | 7.7 m2 (83 sq ft) |
| Tube heating area |
|
| Superheater area | 34.00 m2 (366.0 sq ft) |
| Evaporative heating area | 95.91 m2 (1,032.4 sq ft) |
| Water capacity | 8 m3 (280 cu ft) or 8,000 litres (1,800 imp gal; 2,100 US gal) |
| Fuel | Coal: 3 tonnes (3.0 long tons; 3.3 short tons) |
| Brakes | einlösige 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
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.