Russian locomotive class O

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O class steam locomotive
Ov 841 muzey.jpg
Preserved steam locomotive Ov-841 at the Moscow Railway museum, Rizhsky Rail Terminal
Type and origin
Power type Steam
Build date 1890–1915, 1925–1928
Configuration 0-8-0
Driver diameter 1,200 mm (47.24 in)
Length 9.672 m (31 ft 9 in), w/o tender
Locomotive weight Engine only: 52 to 55 imperial tons
(53 to 56 tonnes)
Fuel type Coal
Boiler pressure Various,
from: 11 kgf/cm2 (1.08 MPa; 156 psi)
to: 15 kgf/cm2 (1.47 MPa; 213 psi)
Firegrate area 1.85 m2 (19.9 sq ft)
Cylinders Two, outside
Cylinder size Simple:
500 mm × 650 mm (19.69 in × 25.59 in)
hp: 500 mm × 650 mm (19.69 in × 25.59 in)
lp: 730 mm × 650 mm (28.74 in × 25.59 in)
Class О

The Russian steam locomotive class O (from Russian: Основной) was an early type of Russian steam locomotives. Between 1890 and 1928, 9129 locomotives were built; hence it was second most numerous locomotive class in Russia, after E class,[1] what was unique number also in the world's scale.


Basic variants were early Od and OD (Russian: Од, OД) with Joy valve gear and most numerous later OV (OВ) with Walschaerts valve gear. Some locomotives were built as two cylinder simple expansion and others as two cylinder compounds.[2]

Armoured locomotives[edit]

In World War I, the Russian civil war and the Eastern Front of World War II O-class locomotives were widely used as standard armoured locomotives in armoured trains.


See also[edit]


  1. ^ Rakov, V.A. (1995), Lokomotivy otechestvennyh zheleznyh dorog 1845-1955, Moscow, ISBN 5-277-00821-7, p.152, 190 (in Russian)
  2. ^ Le Fleming, H.M. and Price, J.H. Russian Steam Locomotives, pp 34-35, John Marshbank Ltd, London, 1960

External links[edit]