The

British Rail British Railways (BR), which from 1965 traded as British Rail, was a state-owned company that operated most of the overground rail transport in Great Britain from 1948 to 1997. It was formed from the nationalisation of the Big Four (British ra ...

Class 12 is a

diesel locomotive A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...

built primarily for

shunting Shunting may refer to: * Ribosome shunting, a mechanism in protein biosynthesis * Shunting (rail), a rail transport operation * Shunting (neurophysiology), a concept in neurophysiology * Shunting (sailing), a maneuver for sailing upwind See a ...

duties around London.

History

This was the second batch of Southern Railway shunters based on the

English Electric N.º UIC: 9094 110 1449-3 (Takargo Rail) The English Electric Company Limited (EE) was a British industrial manufacturer formed after the Armistice of 11 November 1918, armistice of World War I by amalgamating five businesses which, during th ...

6KT 350 hp (260 kW) diesel engine. The first experimental batch (BR numbers 15201–15203) were designed by

Richard Maunsell Richard Edward Lloyd Maunsell (pronounced "Mansell") (26 May 1868 – 7 March 1944) held the post of chief mechanical engineer (CME) of the South Eastern and Chatham Railway from 1913 until the 1923 Grouping and then the post of CME of the ...

of the SR in 1937 and were later classified D3/12. These locomotives were

Oliver Bulleid Oliver Vaughan Snell Bulleid CBE (19 September 1882 – 25 April 1970) was a British railway and mechanical engineer best known as the Chief Mechanical Engineer (CME) of the Southern Railway between 1937 and the 1948 nationalisation, d ...

'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 The London, Midland and Scottish Railway (LMSIt has been argued that the initials LMSR should be used to be consistent with LNER, GWR and SR. The London, Midland and Scottish Railway's corporate image used LMS, and this is what is generally ...

1936–39. 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 The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-cal ...

is an

6-cylinder, 4-stroke, 6KT and the

traction motor A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, elevators or electric multiple unit. Traction motors are used in electrically powered rail vehicles ( electric multip ...

s 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 yard A classification yard (American and Canadian English (Canadian National Railway use)), marshalling yard ( British, Hong Kong, Indian, Australian, and Canadian English (Canadian Pacific Railway use)) or shunting yard (Central Europe) is a railway ...

s at Norwood Junction and

Hither Green Hither Green is a district in south-east London, England, in the London Borough of Lewisham. It forms the southern part of Lewisham, 6.6 miles (10.6 km) south-east of Charing Cross, and on the Prime Meridian. Growing extensively with ...

, and remained there for much of their working lives. The three fitted with Westinghouse air train braking were often used at Dover shunting continental ferry vans before Classes 08 and 09 were generally converted to this system. They were also utilised as works shunters at

Ashford Ashford may refer to: Places Australia *Ashford, New South Wales *Ashford, South Australia *Electoral district of Ashford, South Australia Ireland *Ashford, County Wicklow *Ashford Castle, County Galway United Kingdom *Ashford, Kent, a town **B ...

Brighton Brighton () is a seaside resort and one of the two main areas of the City of Brighton and Hove in the county of East Sussex, England. It is located south of London. Archaeological evidence of settlement in the area dates back to the Bronze A ...

and Eastleigh.

Withdrawal and preservation

The entire class was withdrawn between 1968 and 1971 and most were scrapped soon afterwards. However, three were sold for industrial use with two of those locomotives being scrapped later on. 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 John Cashmore Ltd (also known as J Cashmore, or simply as Cashmore's or other derivations) was a company operating largely in Newport, Monmouthshire, Wales. It became best known for ship breaking and scrapping redundant British railway locomoti ...

. A second, 15231, was sold by BR to Tilling Construction at Grassington. The third, 15224, was sold by BR to the

National Coal Board The National Coal Board (NCB) was the statutory corporation created to run the nationalised coal mining industry in the United Kingdom. Set up under the Coal Industry Nationalisation Act 1946, it took over the United Kingdom's collieries on "ve ...

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 The Spa Valley Railway (SVR) is a standard gauge heritage railway that runs from Tunbridge Wells West railway station in Tunbridge Wells to High Rocks, Groombridge, and Eridge, where it links with the Oxted Line. It crosses Kent and Ea ...

Royal Tunbridge Wells Royal Tunbridge Wells is a town in Kent, England, southeast of central London. It lies close to the border with East Sussex on the northern edge of the High Weald, whose sandstone geology is exemplified by the rock formation High Rocks ...

. A detailed overhaul and 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.

Footnotes

References