British Rail Class 29
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|British Railways Class 29|
D6121 in BR green livery with white stripe and large yellow warning panel and headcode at Inverness MPD, August 1968
|Type and origin|
|Builder||North British Locomotive Co.|
|Build date||1958–1960 (original class 21)|
|Rebuild date||Rebuilt: 1963, 1965–1967|
|Gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
|Wheel diameter||3 ft 7 in (1.092 m)|
|Minimum curve||3.5 chains (70 m)|
|Wheelbase||37 ft 0 in (11.28 m)|
|Length||51 ft 6 in (15.70 m)|
|Width||8 ft 8 in (2.64 m)|
|Height||12 ft 8 in (3.86 m)|
|Locomotive weight||73 long tons (74.2 t; 81.8 short tons)|
|Fuel capacity||460 imp gal (2,100 l; 550 US gal)|
|Prime mover||Paxman Ventura|
|Traction motors||4 GEC DC motors|
|Multiple working||● Red Circle|
|Maximum speed||80 mph (130 km/h)|
|Power output||Engine: 1,350 hp (1,010 kW)|
|Tractive effort||Maximum: 45,000 lbf (200 kN)|
|50 long tons-force (498 kN)|
|Axle load class||Route availability 6 (RA 5 from 1969)|
The British Rail Class 29 were a class of 20 diesel-electric Bo-Bo locomotives produced by the re-engining of the British Rail Class 21 units. The units were designed for both passenger and freight trains. The outwardly similar Class 22 shared no mechanical parts with the 29s.
The machines were produced from 1963 onwards from the North British Class 21 by replacing the original unreliable licence-built MAN of the Class 21s with Paxman Ventura V12 engine at Paxman's Colchester works.
The first unit to be re-engined was D6123, a further 19 machines were re-engined in 1964-1965 at GlasgowWorks and mostly Inverurie Works, along with other modifications including the fitting of four-character headcode displays in the nose ends. After rebuilding, they returned to service from Eastfield depot in Glasgow.
Although these offered more power and much improved reliability over the original Class 21s, they did not survive much longer, due to their small class size and the use of a non-standard high-speed diesel engine. D6108 was withdrawn in May 1969 and scrapped by McWilliams of Shettleston in 1971, while the other 19 were withdrawn between April and December 1971 and scrapped at BR's Glasgow Works in 1971-72. No Class 21, 22 or Class 29 locomotives survive today.
The rebuilt locomotives were numbered:
- Stevens-Stratten, S.W.; Carter, R.S. (1978). British Rail Main-Line Diesels. Shepperton: Ian Allan Ltd. ISBN 0-7110-0617-2.
- Sugden, S.A. Diesel & Electric Loco Register (3rd edn). Sheffield: Platform 5. ISBN 1-872524-55-9.
- Grindlay, Jim. British Railways Locomotive Allocations 1948-1968 (Part 6 - Diesel & Electric Locomotives). Troon: Modelmaster Publications. ISBN 978-0-9544264-6-0.
- Ian Allan ABC of British Railways Locomotives, summer 1966 edition
- McManus, Michael. Ultimate Allocations, British Railways Locomotives 1948 - 1968. Wirral. Michael McManus.
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- Paxman Ventura engine - at Richard Carr's Paxman History pages
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