British Rail Class 22

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

North British Type 2 diesel-hydraulic
British Rail Class 22
D6343, d7072 - old oak common - 1965.jpg
D6343 with Hymek D7072 at Old Oak Common, 1965
Type and origin
Power typeDiesel-hydraulic
BuilderNorth British Locomotive Co.
Build date1959–1962[1]
Total produced58
 • UICB'B'
 • CommonwealthB-B
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 6 in (1.067 m)
Minimum curve4.5 chains (300 ft; 91 m)
Wheelbasebogies 8 ft 6 in (2.59 m)
bogie centers 23 ft (7.0 m)
total34 ft 6 in (10.52 m)
Length46 ft 8 12 in (14.237 m)
Width8 ft 8 in (2.64 m)
Height12 ft 10 in (3.91 m)
Loco weightD6300–D6305: 68 long tons (69 t)[2]
D6306–D6357: 65 long tons (66 t)
Fuel capacity450 imp gal (2,000 l; 540 US gal)
Prime moverD6300-D6305, NBL / MAN L12V18/21A 1,000 bhp (750 kW) at 1445 rpm[3]
D6306-D6357, NBL / MAN L12V18/21BS 1,100 bhp (820 kW) at 1530 rpm
TransmissionHydraulic: Voith / NBL LT.306r
MU workingD6300–D6305: Orange square
D6306–D6357: White diamond
Train heating1,000 pounds (454 kg) per hour steam generator[4] 500 imp gal (2,300 l; 600 US gal) capacity
Loco brakeVacuum controlled air brake, hand brake
Performance figures
Maximum speed75 mph (121 km/h)
Tractive effort38,000 lbf (170,000 N) @ 25% adhesion
OperatorsBritish Railways
NicknamesBaby Warship
Axle load classGWR: Blue[5]
BR: Route availability 4[6]
DispositionAll scrapped
Sources:[7] except where noted

The British Rail Class 22 or "Baby Warship" was a class of diesel-hydraulic locomotives designed for the Western Region of British Railways and built by the North British Locomotive Company. They were very similar in appearance to the Class 21 diesel-electrics; the nickname Baby Warship related to the similarity in appearance (and internal equipment) to the British Rail Class D20/2 or Class 41 Warship Class. The Class 22s were numbered D6300-D6357.[8]



Distribution of locomotives,
July 1967[9]
British Rail Class 22 is located in Southern England
Code Name Quantity
81A Old Oak Common 20
82A Bristol Bath Road 16
83A Newton Abbot 9
84A Laira 13
Total: 58

D6300 was introduced to traffic in 1959 and deliveries continued through until 1962; the Class 22s were allocated to Bristol Bath Road, Laira Plymouth, Newton Abbot and Old Oak Common. The majority of the class always operated in the West of England, on a range of local passenger and freight work, with smaller numbers of the later units operating on local work in the Bristol area and around London Paddington (notably moving empty carriages between the main station and Old Oak Common yard).


Initially the locomotives had some problems with engine and transmission faults, but could be returned to North British Locomotive Works (NBL) for repair under the contractual agreement. By 1961, reliability had improved, but with the more powerful Hymeks and Warships now being available, the locomotives were displaced onto more secondary duties, including work on the former Southern Region lines west of Exeter. By the mid 1960s, the locos had settled down to give reliable service, with availability over 85%.[10][note 1]


NBL went bankrupt in 1962 and, by the late 1960s, withdrawn locomotives were being used to provide spares. Attrition was inevitable and the withdrawals, which had commenced in 1967, finished with the withdrawal of 6333, 6336, 6338 and 6339 on 1 January 1972. Ex-London Midland Region Class 25 diesel-electrics were drafted in as replacements.


The NBL type 2s were introduced in all-over green livery with a light grey skirt band, mid-grey roof, red buffer beams and black underframe. Numbers appeared below all four cab windows and the BR 'lion and wheel' emblem was placed high on the bodyside as centrally as possible. Later a small yellow warning was added. From 1967 some locos were repainted in the new corporate rail blue livery; the first four repaints, D6300, D6303, D6314 and D6327 had small yellow warning panels which they retained until withdrawal, later blue repaints had full yellow ends. Only about half the class were repainted into blue; the BR logo was placed immediately below each cab window, with the loco number below this; on some locos this was reversed.


Dapol released a 00 gauge model of the class 22 in late 2011.[11]


  1. ^ a b Reed 1978, p. 44.
  2. ^ Reed 1978, p. 41.
  3. ^ Reed 1978, pp. 25, 39.
  4. ^ Haresnape 1983, p. 41.
  5. ^ Reed 1978, p. 43.
  6. ^ Strickland 1983, p. 76.
  7. ^ B.R. 33003/94 Preliminary Driver's Instruction for Operating 1,100 H.P. Diesel Hydraulic Locomotives Nos. D.6306-D.6357, British Transport Commission, June 1961
  8. ^
  9. ^ British Rail Locoshed Book. Shepperton: Ian Allan. February 1968. p. 27. ISBN 0-7110-0004-2.
  10. ^ Railway World annual, 1980, Chris Leigh, p 114-119
  11. ^ Andy Y (8 November 2011). "Dapol Class 22 - Photo Review". RMweb. Retrieved 18 November 2011.


  1. ^ Average availability was 85%, with one locomotive permanently out of action, with no action being taken to fix it.


  • Haresnape, Brian (September 1983) [1982]. British Rail Fleet Survey 2: Western Region Diesel-Hydraulics. Shepperton: Ian Allan. ISBN 0-7110-1122-2. CX/0983.
  • Preedy, Norman E; Gillham, G F (1974). WR Diesel Hydraulics. Truro: D Bradford Barton.
  • Reed, Brian (1978) [1975]. Diesel-Hydraulic Locomotives of the Western Region. Newton Abbot: David & Charles. ISBN 0-7153-6769-2.
  • Stevens-Stratten, S.W.; Carter, R.S. (1978). British Rail Main-Line Diesels. Shepperton: Ian Allan Ltd. ISBN 0-7110-0617-2.
  • Strickland, D.C. (March 1983). D+EG Locomotive Directory. Camberley: Diesel & Electric Group. ISBN 0-906375-10-X.
  • Ian Allan ABC of British Railways Locomotives, summer 1966 edition

Further reading[edit]

  • McManus, Michael. Ultimate Allocations, British Railways Locomotives 1948 - 1968. Wirral. Michael McManus.

External links[edit]