PKP class Ok1

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Ok 1-322 Wolsztyn 12.10.05.jpg
Ok1-359 in Wolsztyn
Type and origin
Power type Steam
Builder Schwartzkopff
Build date 1908–1928
 • Whyte 4-6-0
 • UIC 2′C h2
Gauge 1,435 mm (4 ft 8 12 in) standard gauge
Leading dia. 1,000 mm (39.37 in)
Driver dia. 1,750 mm (68.90 in)
Length 18,585 mm (60 ft 11 34 in)
Height 4.550 m (14 ft 11 in)
Axle load 16.6–17.3 tonnes (16.3–17.0 long tons; 18.3–19.1 short tons)
Adhesive weight 50.6 tonnes (49.8 long tons; 55.8 short tons)
Loco weight 78.2 tonnes (77.0 long tons; 86.2 short tons)
Fuel capacity 7.0 tonnes (6.9 long tons; 7.7 short tons)
 • Firegrate area
14.28 m2 (153.7 sq ft)
Boiler pressure 1.2 MPa (170 lbf/in2)
Heating surface:
 • Firebox
2.64 m2 (28.4 sq ft)
Cylinder size 575 mm × 630 mm (22.64 in × 24.80 in)
Operators PKP
Class Ok1

Ok1 is the Polish designation of a Prussian steam locomotive, the Prussian P 8, used on Polish State Railways. Production of the P 8 lasted from 1908 until 1928 and this locomotive was used on practically all European railway lines.

After the end of World War I, 192 Class P 8 engines were handed over as a reparation to Poland, including two machines for Free City of Danzig, where they were re-designated as Class Ok1 locomotives (numbers: Ok1-1 to Ok1-190 and Ok1-1Dz and 2Dz for Danzig machines).[1] Since the class was considered successful, further 65 locomotives were built in Germany at Polish order in 1922-1923 (designated Ok1-201 to 265).[1]

During World War II all the locomotives were captured by the Germans or Soviets and most were pressed into the German Railways. After the war, along with new war reparations, Poland received 429 locomotives P 8 (numbers Ok1-1 to 429), what made it by far the most numerous passenger locomotive in the country.[1] They were used until the late 1970s - last locomotive was withdrawn from line service in 1981.[1] A few engines were preserved, including Ok1-359 (see the photograph), which is stabled at the Wolsztyn museum.

See also[edit]


  1. ^ a b c d Terczyński, P. (2003), pp. 52, 56
  • Terczyński, Paweł (2003). Atlas parowozów [Steam locomotives' atlas] (in Polish). Poznań. p. 56. ISBN 83-901902-8-1. 

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