GNR Class H4
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|GNR Class H4
LNER Class K3
61841 approaching Hucknall Central 1958
Armstrong Whitworth, (40)
Robert Stephenson & Co.,
North British Locomotive Co.
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||5 ft 8 in (1.727 m)|
|Locomotive weight||72.6 long tons (73.8 t)|
|Boiler pressure||180 psi (1.24 MPa)|
|Cylinder size||18.5 in × 26 in (470 mm × 660 mm)|
|Tractive effort||30,030 lbf (133.6 kN)|
|Power class||BR: 5P6F|
The type was a more powerful development of the earlier H3 (LNER K2) class and was notable at the time, as the 6-foot-diameter (1.8 m) boilers were the largest fitted to any British locomotive to that date. After formation of the London and North Eastern Railway, the type became known as class K3 and was adopted as an LNER standard design.
The first ten locomotives were built at the GNR's Doncaster Works in 1920, to the design of Nigel Gresley. Six further batches were built at Doncaster and Darlington Works, Armstrong Whitworth, Robert Stephenson and Company and the North British Locomotive Company. The last examples were delivered in 1937, with a total of 193 locomotives having been built.
They were excellent mixed-traffic locomotives, although their large size restricted their route availability. In their latter years they were primarily employed on vacuum-fitted freight traffic.
Accidents and incidents
Main article: Welwyn Garden City rail crashes
- On 15 June 1936, locomotive No. 4009 was hauling an express passenger train which was in a rear-end collision at Welwyn Garden City, Hertfordshire due to a signalman's error. Fourteen people were killed and 29 were injured.
- In July 1936, locomotive No. 2764 was involved in a serious accident at Postland, Lincolnshire.
- On 8 March 1937, locomotive No. 126 was hauling a passenger train that was derailed at Langrick, Lincolnshire due to the condition of the track.
- On 25 August 1956, locomotive No. 61846 was hauling an empty stock train which ran away and crashed through the buffers at Filey Holiday Camp station, Yorkshire. The accident was due to the failure to connect the brake pipe between the train and locomotive.
The original ten locomotives were numbered 1000–1009 by the GNR, and became LNER 4000–4009. Those built for the LNER were numbered haphazardly, filling in gaps in the LNER's numbering scheme. In the LNER's 1946 renumbering programme, the K3s and K5 were renumbered 1800–1992, and they later became British Railways 61800–61992.
All were withdrawn between 1959 and 1962 (the K5 going in 1960). None survived into preservation.
- Longworth, Hugh (2005). British Railway Steam Locomotives 1948-1968. Hersham: Ian Allan. ISBN 978-0-86093-593-3.
- Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 17
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