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GNR Class O2 information


GNR Class O2
O2/3 2-8-0 No. 3963 at Doncaster 1947
Type and origin
Power typeSteam
DesignerNigel Gresley
Builder
  • Doncaster Works (57)
  • North British Locomotive Co. (10)
Build date1918, 1921 – 1943
Total produced67
Specifications
Configuration:
 • Whyte2-8-0
 • UIC1'Dh3
Gauge4 ft 8+12 in (1,435 mm)
Leading dia.2 ft 8 in (1 m)
Coupled dia.4 ft 8 in (1 m)
Length63 ft 3 in (19.28 m)
Width8 ft 9 in (2.67 m)
Height12 ft 11.25 in (3.9434 m)
Loco weight74.1–78.65 long tons (75.29–79.91 t)
Tender weight43.1–52 long tons (43.8–52.8 t)
Fuel typeCoal
Firebox:
 • Grate area27.5 sq ft (2.55 m2)
Boiler:
 • Diameter5 ft 4.75 in (1,644.6 mm) or 5 ft 6 in (1,680 mm)
Boiler pressure180 lbf/in2 (1.24 MPa)
Heating surface2,032 sq ft (188.8 m2)
Superheater:
 • Heating area430.5 sq ft (39.99 m2)
CylindersThree
Cylinder size18+12 in × 26 in (470 mm × 660 mm)
Valve gearGresley conjugated
Valve type8-inch (203 mm) piston valves
Performance figures
Tractive effort36,740 lbf (163.4 kN)
Career
Operators
  • Great Northern Railway
  • London and North Eastern Railway
  • British Railways
Power classBR: 8F
NumbersGNR: 461, LNER: 3921-3987, BR: 63921-63987
LocaleEastern Region
Withdrawn1948, 1960 – 1963
DispositionAll scrapped

The Great Northern Railway (GNR) Class O2 was a class of three-cylinder 2-8-0 steam locomotives designed by Nigel Gresley for freight work and built by the GNR from 1921. Further examples were built by the London and North Eastern Railway (LNER) from 1924.

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