Prussian P 8

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