GNR Class O1

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GNR O1/LNER 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
Builder GNR Doncaster Works
Build date 1914-1919
Total produced 20
Configuration 2-8-0
Gauge 4 ft 8 12 in (1,435 mm)
Leading wheel
3 ft 2 in (0.97 m)
Driver diameter 4 ft 8 in (1.42 m)
Locomotive weight 76.2–78.65 long tons (77.42–79.91 t)
Fuel type coal
Boiler pressure 180 psi (1.2 MPa)
Cylinders 2
Cylinder size 21 in × 28 in (530 mm × 710 mm)
Performance figures
Tractive effort 33,735 lbf (150.06 kN)
Power class 8F

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Seventeen examples survived into British Railways ownership in 1948, but all had been withdrawn by 1952.


External links[edit]