GNR Class O1

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GNR O1 class
LNER O1 (later O3) Class
Immingham Locomotive Depot geograph-2463746-by-Ben-Brooksbank.jpg
No. 3491 at Immingham Locomotive Depot 1947
Type and origin
Power type Steam
Designer Nigel Gresley
Build date 1914–1919
Total produced 20
 • Whyte 2-8-0
 • UIC 1′D h2
Gauge 4 ft 8 12 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
 • Firegrate area
27 sq ft (2.5 m2)
 • Diameter 5 ft 6 in (1,680 mm)
Boiler pressure 180 lbf/in2 (1.24 MPa)
Heating surface 2,084 sq ft (193.6 m2)
 • Firebox 162 sq ft (15.1 m2)
 • 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)
Power class 8F
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Withdrawn 1947–1952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.


Gresley designed the O1 2-8-0 for the heavy coal trains on the mainline from Grantham to London, ordering five examples 1913, which were completed at Doncaster in 1914. A further fifteen were ordered in January 1916, but due to the First World War delays were incurred and construction was transferred to the North British Locomotive Company, who delivered the first ten in April 1918, followed by a further five in 1919.

The class was re-designated O3 by the London and North Eastern Railway in 1944.

British Railways[edit]

Seventeen examples survived into British Railways ownership in 1948, but all had been withdrawn by 1952.


  • Boddy, M. G.; Brown, W. A.; Neve, E.; Yeadon, W. B. (November 1983). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 6B: Tender Engines—Classes O1 to P2. Kenilworth: RCTS. ISBN 0-901115-54-1. 

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