The Prussian Class P 8 of the Prussian state railways (DRG Class 38.10-40 of the Deutsche Reichsbahn) was a 4-6-0 steam locomotive built from 1906 to 1923 by the Berliner Maschinenbau (previously Schwartzkopff) and twelve other German factories. The design was created by Robert Garbe. It was intended as a successor to the Prussian P 6, which was regarded as unsatisfactory.
Prussian P 8
DRG Class 38.10–40 |
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Prussian P 8 in state railway livery |
| Type and origin |
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| Build date | 1908 - 1926 |
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| Total produced | ca. 3,700 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-0 |
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| • German | P 35.15 |
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| Gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge
1,524 mm (5 ft) Russian Railways |
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| Leading dia. | 1,000 mm (39.37 in) |
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| Driver dia. | 1,750 mm (68.90 in) |
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Length:
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| • Over beams | 18,585 mm (60 ft 11+3⁄4 in) |
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| Axle load | 17.36 t (17.09 long tons; 19.14 short tons) |
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| Adhesive weight | 50.60 t (49.80 long tons; 55.78 short tons) |
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| Service weight | 69–76.69 t (67.91–75.48 long tons; 76.06–84.54 short tons) |
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| Boiler pressure | 12 bar (1,200 kPa; 170 psi) |
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| Heating surface: | |
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| • Firebox | 2.58 m2 (27.8 sq ft) |
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| • Radiative | 14.58 m2 (156.9 sq ft) |
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| • Evaporative | 143.28 m2 (1,542.3 sq ft) |
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Superheater:
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| • Heating area | 58.90 m2 (634.0 sq ft) |
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| Cylinder size | 575 mm (22.64 in) |
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| Piston stroke | 630 mm (24.80 in) |
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| Train heating | Steam from locomotive boiler |
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| Loco brake | Knorr automatic, single-chamber compressed-air brakes, working both sides of the coupled wheels, from 1913 bogie wheels also braked |
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| Performance figures |
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| Maximum speed | 110 km/h (68 mph) (forwards)
50 km/h (31 mph) (backwards)
85 km/h (53 mph) (backwards with tub tender) |
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| Indicated power | 868 kW (1,164 hp) |
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| Career |
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| Retired | 1974 |
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| Disposition | Eighteen preserved, remainder scrapped |
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