GER Class D81
|GER Class D81
LNER Class J20
J20 No. 4697 rests along with numerous other freight engines at March Locomotive Depot on Sunday 14 July 1946
|Type and origin|
|Designer||A. J. Hill|
|UIC classification||C h2|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||4 ft 11 in (1.499 m)|
|Wheelbase||40 ft 11 in (12.47 m)|
|Length||54 ft 6 in (16.61 m) over buffers|
|Locomotive weight||54 long tons 15 cwt (122,600 lb or 55.6 t)|
|Boiler pressure||180 lbf/in2 (1.24 MPa)|
|Firegrate area||26.5 sq ft (2.46 m2)|
|1,834.2 sq ft (170.40 m2)|
|Cylinder size||20 in × 28 in (508 mm × 711 mm)|
|Tractive effort||29,044 lbf (129.19 kN)|
|Power class||BR: 5F|
|Axle load class||LNER/BR: RA 5|
The GER Class D81 was a class of twenty-five 0-6-0 steam locomotives designed by A. J. Hill for the Great Eastern Railway. The all passed to the London and North Eastern Railway at the 1923 grouping and received the classification J20.
These locomotives were fitted with 20-by-28-inch (508 mm × 711 mm) cylinders and 4-foot-11-inch (1.499 m) wheels, while the Belpaire firebox-fitted boiler was identical to that fitted to the Class S69 4-6-0s. They were the most powerful 0-6-0 tender locomotive in Britain until the arrival of O. V. S. Bulleid's Q1 class for the Southern Railway in 1942.
|Year||Order||Manufacturer||Quantity||GER Nos.||LNER Nos.||1946 Nos.||Notes|
All were still in service at the 1923 grouping, the LNER adding 7000 to the numbers of nearly all the ex-Great Eastern locomotives, including the Class D81 locomotives. Between 1943 and 1956 the class was rebuilt with round-top fireboxes, and reclassified as J20/1.
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- Aldrich, C. Langley (1969). The Locomotives of the Great Eastern Railway 1862–1962 (7th ed.). Wickford, Essex: C. Langley Aldrich. OCLC 30278831.
- Baxter, Bertram (2012). Baxter, David; Mitchell, Peter, eds. British Locomotive Catalogue 1825–1923, Volume 6: Great Eastern Railway, North British Railway, Great North of Scotland Railway, Midland & Great Northern Joint Railway, remaining companies in the LNER group. Southampton: Kestrel Railway Books. ISBN 978-1-905505-26-5.
|Wikimedia Commons has media related to GER Class D81 / LNER Class J20.|
- D81 Class 0-6-0 – Great Eastern Railway Society
- The Hill J20 (GER Class D81) 0-6-0 Locomotives – LNER Encyclopedia