GNR Class O1
No. 3491 at Immingham Locomotive Depot 1947
|Type and origin|
|Builder||GNR Doncaster Works|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|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)|
|Boiler pressure||180 psi (1.2 MPa)|
|Cylinder size||21 in × 28 in (530 mm × 710 mm)|
|Tractive effort||33,735 lbf (150.06 kN)|
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.
Seventeen examples survived into British Railways ownership in 1948, but all had been withdrawn by 1952.
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