British Rail Class 12

The British Rail Class 12 is a diesel locomotive built primarily for shunting duties around London.

British Rail Class 12
15224 at Spa Valley Railway, Tunbridge Wells West depot 31 July 2011
Type and origin
Power typeDiesel-electric
BuilderBritish Railways Ashford Works
Order numberSR 3413 (15), 3537 (11)
Build date1949–1952
Total produced26
Specifications
Configuration:
  Whyte0-6-0
  UICC
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter4 ft 6 in (1.372 m)
Wheelbase11 ft 6 in (3.51 m)
Length29 ft 5 12 in (8.98 m)
Width9 ft 0 in (2.74 m)
Height12 ft 8 12 in (3.87 m)
Loco weight48 long tons (48.8 t; 53.8 short tons)
Fuel capacity660 imp gal (3,000 l; 790 US gal)
Prime moverEnglish Electric 6KT
GeneratorEnglish Electric 801/7D (DC)
Traction motorsEnglish Electric 506A, 2 off
TransmissionDiesel electric, double reduction gearing
MU workingNot fitted
Train heatingNone
Train brakesNone; 15230–15232 Air from 1970
Performance figures
Maximum speed27.5 mph (44.3 km/h)
Power outputEngine: 350 hp (261 kW)
Tractive effortMaximum: 24,600 lbf (109.4 kN)
Career
OperatorsBritish Railways
ClassD3/13, later 3/9, later Class 12
Numbers15211–15236
Axle load classRA 5
Withdrawn1968-1971
Preserved15224 at the Spa Valley Railway
DispositionOne preserved, remainder scrapped
References: [1]

History

This was the second batch of Southern Railway shunters based on the English Electric 6KT 350 hp (260 kW) diesel engine. The first experimental batch (BR numbers 15201–15203) were designed by Richard Maunsell of the SR in 1937 and were later classified D3/12. These locomotives were Oliver Bulleid's development of Maunsell's original design, but were significantly lighter. They featured Bulleid's distinctive BFB wheels, and incorporated a number of details from the diesel-electric shunters produced by the London Midland and Scottish Railway 1936–39.[2] They were built at the BR Ashford Works over the period 1949–1952 and numbered 15211–15236. They later became Class 12, but no locomotives survived long enough to acquire Class 12 TOPS numbers.

Technical details

The diesel engine is an English Electric 6-cylinder, 4-stroke, 6KT and the traction motors are two EE506 axle-hung, nose-suspended, force-ventilated traction motors with 17.5:1 double reduction gear drive. The main generator is an EE type EE801/7D, flange-mounted single bearing rated at 490 kW.

Operational details

The locomotives were designed for use in the two south London marshalling yards at Norwood Junction and Hither Green, and remained there for much of their working lives. Later some examples were used as works shunters at Ashford, Brighton and Eastleigh.

Withdrawal and Preservation

The entire class was withdrawn between 1968 and 1971 and most were cut up for scrap soon afterwards. However, three were sold for industrial use with two of those locomotives being scrapped later on.[3] One, 15222, had been used as a generator by a quarry in South Wales having been acquired from the Newport scrapyard of John Cashmore Ltd. A second, 15231, was sold by BR to Tilling Construction at Grassington. The third, 15224, was sold by BR to the National Coal Board for use in the Kent Coalfield. After use at Betteshanger and Snowdown collieries, it passed into preservation in 1982. It is now the only surviving locomotive of the class, and is currently in storage awaiting overhaul at the Spa Valley Railway, Royal Tunbridge Wells. A detailed overhaul/restoration scoping plan is in development; the locomotive requires a complete re-wire as the original wiring is suffering age related deterioration. As of January 2021, the project is on hold awaiting suitable funding.

Table of withdrawals[3]
YearQuantity in
service at
start of year
Quantity
withdrawn
Locomotive numbers
196826415213/15/34/36.
196922515216/23/26/28/33.
197017315217–18/27.
1971141415211–12/14/19–22/24–25/29–32/35.

Footnotes

  1. Marsden 1981, “SR: 15211-15236”.
  2. Bradley 1975, p. 52.
  3. Strickland 1983, p. 63.

References

  • Bradley, D.L. (1975). Locomotives of the Southern Railway, Part 1. Oxford: Railway Correspondence and Travel Society. ISBN 0-901115-30-4.CS1 maint: ref=harv (link)
  • Marsden, Colin (1981). The diesel shunter: a pictorial record. Oxford: Oxford Publishing Company. ISBN 0-86093-108-0.CS1 maint: ref=harv (link)
  • Strickland, David C. (September 1983). Locomotive Directory: Every Single One There Has Ever Been. Camberley, Surrey: Diesel and Electric Group. ISBN 978-0-9063-7510-5. OCLC 16601890.

Further reading

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