Russian locomotive class O

The Russian steam locomotive class O (from Russian: Основной) was an early type of Russian steam locomotives. 9,129 locomotives were built between 1890 and 1928; hence it was the second most numerous class of locomotive in Russia, after E class,[1] which was a unique number even on the international level.

O class steam locomotive
Preserved steam locomotive Ov-841 at the Moscow Railway museum, Rizhsky Rail Terminal
Type and origin
Power typeSteam
Build date1890–1915, 1925–1928
Specifications
Configuration:
​
 • Whyte0-8-0
Gauge1,524 mm (5 ft)
Driver dia.1,200 mm (47.24 in)
Length9.672 m (31 ft 8+3⁄4 in), w/o tender
Loco weightEngine only: 52 to 55 long tons (53 to 56 t; 58 to 62 short tons)
Fuel typeCoal
Firebox:
 • Firegrate area		1.85 m2 (19.9 sq ft)
Boiler pressureVarious,
from: 11 kgf/cm2 (1.08 MPa; 156 psi)
to: 15 kgf/cm2 (1.47 MPa; 213 psi)
CylindersTwo, outside
Cylinder sizeSimple:
500 mm × 650 mm (19.69 in × 25.59 in)
Compound:
hp: 500 mm × 650 mm (19.69 in × 25.59 in)
lp: 730 mm × 650 mm (28.74 in × 25.59 in)
Career
ClassО


Variants

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

During 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 due to rugged construction and low silhouette. Relatively lightweight, these locomotives could carry more armor without overloading the track.

See also

References
  1. Rakov, V.A. (1995). Lokomotivy otechestvennyh zheleznyh dorog 1845-1955 (in Russian). Moscow. pp. 152 and 190. ISBN 5-277-00821-7.{{cite book}}: CS1 maint: location missing publisher (link)
  2. Le Fleming, H.M.; Price, J.H. (1960). Russian Steam Locomotives. London: John Marshbank Ltd. pp. 34–35.
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