Ok1 is the Polish designation of a

Prussia Prussia, , Old Prussian: ''Prūsa'' or ''Prūsija'' was a German state on the southeast coast of the Baltic Sea. It formed the German Empire under Prussian rule when it united the German states in 1871. It was ''de facto'' dissolved by an ...

n steam locomotive, the

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. Th ...

, used on

Polish State Railways (''PKP S.A.''; en, Polish State Railways, Inc.) is the dominant Rail transport operations, railway operator in Poland. The company was founded when the former state-owned enterprise was divided into several units based on the need for separati ...

. 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 World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

, 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).Terczyński, P. (2003), pp. 52, 56 Since the class was considered successful, further 65 locomotives were built in Germany at Polish order in 1922-1923 (designated Ok1-201 to 265). During

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...

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. They were used until the late 1970s - last locomotive was withdrawn from line service in 1981. A few engines were preserved, including Ok1-359 (see the photograph), which is stabled at the Wolsztyn museum.

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* Railway locomotives introduced in 1908 4-6-0 locomotives Ok01 Berliner locomotives Passenger locomotives Standard gauge locomotives of Poland {{poland-rail-transport-stub pl:Ok1

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