This article is about a class of 2-8-0 steam locomotives of the Great Northern Railway (United Kingdom) introduced in 1913. For the class of 2-8-2 steam locomotives of the Great Northern Railway (United States) introduced in 1911, see Great Northern O-1.
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GNR O1 class LNER O1 (later O3) Class
No. 3491 at Immingham Locomotive Depot 1947
Type and origin
Power type
Steam
Designer
Nigel Gresley
Builder
Doncaster Works (5)
North British Locomotive Co. (15)
Build date
1913–1919
Total produced
20
Specifications
Configuration:
• Whyte
2-8-0
• UIC
1′D h2
Gauge
4 ft 8+1⁄2 in (1,435 mm)
Leading dia.
3 ft 2 in (965 mm)
Coupled dia.
4 ft 8 in (1,422 mm)
Length
60 ft 11.5 in (18.580 m)
Loco weight
76.2–78.65 long tons (77.42–79.91 t)
Fuel type
Coal
Firebox:
• Grate area
27 sq ft (2.5 m2)
Boiler:
• Diameter
5 ft 6 in (1,680 mm)
Boiler pressure
180 lbf/in2 (1.24 MPa)
Heating surface:
• Firebox
162 sq ft (15.1 m2)
• Total surface
2,084 sq ft (193.6 m2)
Superheater:
• Type
24
• Heating area
570 sq ft (53 m2)
Cylinders
Two, outside
Cylinder size
21 in × 28 in (533 mm × 711 mm)
Valve gear
Walschaerts
Valve type
10-inch (254 mm) piston valves
Performance figures
Tractive effort
33,735 lbf (150.06 kN)
Career
Operators
Great Northern Railway (Great Britain)
London and North Eastern Railway
British Railways
Power class
8F
Nicknames
Tangos
Axle load class
Route availability 6
Withdrawn
1947–1952
Disposition
All scrapped
The Great Northern Railway (GNR) Class O1 was a class of two-cylinder 2-8-0 steam locomotive designed by Nigel Gresley for heavy freight work and built by the GNR between 1913 and 1919.
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Neilson and Co and between 1892 and 1897. The J14s were similar to the GNRClass J13 albeit with different boilers and without a steam dome. 17 J14s were...
fully reflected the LNER 1946 renumbering scheme, which had grouped most classes into single number blocks. BR allocated numbers in March 1948 (in the meantime...
LNER B17/4s, some of the class moved away from the Great Central Main Line to the Great Eastern Main Line and to former GNR lines, where they hauled stopping...
July 1922, the Great Northern Railway (GNR) filed Engine Order No. 297 which gave the green-light for ten Class A1 4-6-2 "Pacific" locomotives to be built...
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