DRG Class 87
The German Class 87 was a standard (see Einheitsdampflokomotive) goods train tank locomotive with the Deutsche Reichsbahn-Gesellschaft (DRG). It was specifically designed by the firm of Orenstein & Koppel for use in Hamburg Harbour. The harbour lines had minimal curve radii of only 100 metres (330 ft) and high train loads to be moved. The axle load had to be no more than 17.5 tonnes (17.2 long tons; 19.3 short tons). These requirements resulted in an axle count of five axles. In order to keep wear and tear on the running gear within acceptable limits only the middle three wheelsets were linked by coupling rods, the two Luttermöller outside axles were driven by cogs.
| DRG Class 87 | |
|---|---|
| Number(s) | DRG 87 001 – 87 016 |
| Quantity | 16 |
| Manufacturer | Orenstein & Koppel |
| Year(s) of manufacture | 1927–1928 |
| Retired | 1951–1956 |
| Wheel arrangement | 0-10-0T |
| Axle arrangement | E h2t |
| Type | Gt 55.17 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Length over buffers | 13,300 mm (43 ft 7 1⁄2 in) |
| Empty weight | 68 tonnes (67 long tons; 75 short tons) |
| Service weight | 85.6 tonnes (84.2 long tons; 94.4 short tons) |
| Adhesive weight | 85.6 tonnes (84.2 long tons; 94.4 short tons) |
| Axle load | 17.4 tonnes (17.1 long tons; 19.2 short tons) |
| Top speed | 45 km/h (28 mph) |
| Indicated Power | 691 kW (939 PS; 927 hp) |
| Driving wheel diameter | 1,100 mm (3 ft 7 1⁄4 in) |
| No. of cylinders | Two |
| Cylinder bore | 600 mm (23 5⁄8 in) |
| Piston stroke | 550 mm (21 5⁄8 in) |
| Boiler Overpressure | 14 bar (1.40 MPa; 203 psi) |
| No. of heating tubes | 110 |
| No. of smoke tubes | 26 |
| Heating tube length | 4,500 mm (14 ft 9 1⁄4 in) |
| Grate area | 2.39 m2 (25.7 sq ft) |
| Radiative heating area | 10 m2 (110 sq ft) |
| Tube heating area | 107.27 m2 (1,154.6 sq ft) |
| Superheater area | 47.00 m2 (505.9 sq ft) |
| Evaporative heating area | 117.37 m2 (1,263.4 sq ft) |
| Water capacity | 9 m3 (320 cu ft) pr 9,000 litres (2,000 imp gal; 2,400 US gal) |
| Fuel | Coal: 3 tonnes (3.0 long tons; 3.3 short tons) |
Due to damage the vehicles were partly also operated as 1′D, D1′ or 1′C1′ engines.
From 1951 they were superseded by DB Class 82 locomotives.