Steam locomotive O
Encyclopedia
The russian steam locomotive class O (from ) was an early type of russian steam locomotive
Steam locomotive
A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

s. Between 1890 and 1928, 9129 locomotives were built; the type was the most numerous in Russia..

In the Great patriotic war O-class locomotives were widely used in armoured train
Armoured train
An armoured train is a train protected with armour. They are usually equipped with railroad cars armed with artillery and machine guns. They were mostly used during the late 19th and early 20th century, when they offered an innovative way to quickly move large amounts of firepower...

s.
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