British Rail Class 22

British Rail Class 22

Infobox Locomotive
name = North British Type 2 diesel-hydraulic
British Rail Class 22
powertype = Diesel-hydraulic


caption = D6343 with Hymek D7072 at Old Oak Common, 1965.
roadnumber = D6300–D6357
totalproduction = 58
nicknames = "Baby Warship"
builder = North British Locomotive Co.
builddate = 1959–1962
gauge = RailGauge|ussg|lk=on|al=on
primemover = MAN L12V18/21A or 21B
transmission = Hydraulic: Voith LT306r
whytetype = B-B
uicclass = B'B'
wheeldiameter = convert|3|ft|7|in|m|3|abbr=on
minimumcurve =
trainbrakes = Vacuum
locobrakeforce =
wheelbase = convert|31|ft|6|in|abbr=on
length = convert|46|ft|8+1/2|in|abbr=on
width = convert|8|ft|8|in|abbr=on
height = convert|12|ft|10|in|abbr=on
weight = "D6300–D6305:" convert|68|LT|sigfig=3|lk=on
"D6306–D6357:" convert|65|LT|sigfig=3
topspeed = convert|75|mph|km/h|0|abbr=on|lk=on
poweroutput = "Engine:" convert|1000|hp|0|abbr=on|lk=on or convert|1100|hp|0|abbr=on
tractiveeffort = "Maximum:" convert|40000|lbf|kN|1|abbr=on|lk=on
fuelc
convert|450|impgal|abbr=on|lk=on
trainheating = convert|1000|lb per hour steam generator
multipleworking = "D6300–D6305:" ■ Orange square
"D6306–D6357:" ◆ White diamond
axleloadclass = "GWR:" ●Yellow
"BR:" Route availability 4
railroad = British Railways
retiredate = 1967–1972
disposition = All scrappedThe British Rail Class 22 or "Baby Warship" was a class of diesel-hydraulic locomotives designed for the Western Region and built by North British Locomotive Company. They were very similar in appearance to the Class 21 diesel-electrics.

History

D6300 was introduced to traffic in 1958 and deliveries continued through until 1962.

The Class 22s were allocated to Bristol Bath Road, Laira Plymouth, Newton Abbot and Old Oak Common.

Reliability was poor and withdrawals commenced in 1967 and finished with the withdrawal of 6333, 6336, 6338 and 6339 in December 1971. This was partly because of prejudices against hydraulic transmission high up in BR's engineering wings which deemed all the Western Region's diesel-hydraulic locomotives non-standard. Ex-Eastern Region Class 31 diesel-electrics were drafted in as replacements.

The Class is now extinct, but an attempt was made to preserve D6319. A purchase price was agreed with BR but before the locomotive could be moved to safety it was cut up by staff at Swindon Works. BR offered the purchaser the opportunity to purchase a Warship class locomotive at the same price and D821 "Greyhound" thus became the first preserved ex-BR mainline diesel locomotive.

Description

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 locos were repainted in the new corporate rail blue livery with full yellow ends. The "arrows of confusion" logo was placed immediately below each cab window, with the loco number below this although on some locos this was reversed.

Technical details

* Introduced: 1959
* Weight:
** D6300-D6305, 68 tons
** D6306-D6357, 65 tons
* Engine:
** D6300-D6305, NBL/MAN 1,000 bhp
** D6306-D6357, NBL/MAN 1,100 bhp
* Transmission: Hydraulic, Voith/NBL L.T.306r
* Maximum tractive effort: 40,000 lb
* Driving wheel diameter: 3ft 7in
* Coupling code:
** D6300-D6305, Orange square
** D6306-D6357, White diamond
* Train heating: Steam generator

Class 22 electric locomotive

Class 22 was also used as the TOPS classification for the dual voltage BB 22200 Class locomotives belonging to SNCF that were utilised on freight workings through the Channel Tunnel prior to the delivery of the Class 92 locomotives during 1994 and 1995 [http://www.therailwaycentre.com/Resource_data/All%20Time%20class%20Loco.pdf]

ources

*cite book | last = Preedy | first = Norman E | coauthors = Gillham, G F| title = WR Diesel Hydraulics | publisher = D Bradford Barton | date = 1974 | location = Truro
*cite book | last = Stevens-Stratten | first = S.W. | coauthors = Carter, R.S. | title = British Rail Main-Line Diesels | publisher = Ian Allen Ltd | date = 1978 | location = Shepperton | isbn = 0 7110 0617 2
*Ian Allan ABC of British Railways Locomotives, summer 1966 edition

External links

* [http://www.greatwestern.org.uk/d6300m_in.htm The Western Region Archive]


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