Prussian P 8

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 date1908 - 1926
Total producedca. 3,700
Specifications
Configuration:
 • Whyte4-6-0
 • GermanP 35.15
Gauge1,435 mm (4 ft 8+12 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 beams18,585 mm (60 ft 11+34 in)
Axle load17.36 t (17.09 long tons; 19.14 short tons)
Adhesive weight50.60 t (49.80 long tons; 55.78 short tons)
Service weight69–76.69 t (67.91–75.48 long tons; 76.06–84.54 short tons)
Boiler pressure12 bar (1,200 kPa; 170 psi)
Heating surface:
 • Firebox2.58 m2 (27.8 sq ft)
 • Radiative14.58 m2 (156.9 sq ft)
 • Evaporative143.28 m2 (1,542.3 sq ft)
Superheater:
 • Heating area58.90 m2 (634.0 sq ft)
Cylinder size575 mm (22.64 in)
Piston stroke630 mm (24.80 in)
Train heatingSteam from locomotive boiler
Loco brakeKnorr automatic, single-chamber compressed-air brakes, working both sides of the coupled wheels, from 1913 bogie wheels also braked
Performance figures
Maximum speed110 km/h (68 mph) (forwards)
50 km/h (31 mph) (backwards)
85 km/h (53 mph) (backwards with tub tender)
Indicated power868 kW (1,164 hp)
Career
Retired1974
DispositionEighteen preserved, remainder scrapped