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London Underground D-Stock

Entered service: 1980

Built by: Metro-Cammell of Birmingham

Lines: District Line (everywhere except between Edgware Road and High Street Kensington)

Length per car: 18.37m (driving motor car), 18.12m (uncoupling non-driving motor car)

Width: 2.85m

Height: 3.62m

Weight: 27.46 tonnes (driving motor car), 26.11 tonnes (uncoupling non-driving motor car), 18.40 tonnes (trailer)

Between 1980 and 1983, 75 six-car D78-Stock trains were introduced to the District Line. Each train comprises two three-car units (a driving motor car, a trailer and either another driving car or a non-driving car).

There are three types of D-Stock car: Driving motor cars are fitted with driving controls and traction motors; uncoupling non-driving motor cars are fitted with traction equipment but no driving controls or accommodation, and have a small cabinet to allow uncoupling and shunting; and finally the trailer coach, which has neither driving or traction controls.

Despite being surface stock, D-Stock is similar to 1973 Tube stock. It has the same size wheels and a similar traction package. Surface stock usually has wheels of 1,067mm in diameter (compared with the 790mm wheels on Tube stock). But D-Stock having the smaller Tube wheels allows more headroom and reduces maintenance costs by lowering the number of different types in use.

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  • Malcolm - 16/01/2015 17:37

    No, the smaller wheels DID NOT permit more head room. Floor height is the same as previous "surface" stock with the 1067mm wheels. The article is right however that the motors, gearboxes and wheelsets are virtually the same as the 1973 tube stock. It is S stock where the use of smaller wheels hasxallowed a lower floor andchence more head room, although roof space was taken up by the air conditioning kit. I have to be away by 0925on Friday but can come in at 8.15.ow the smaller wheels

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  • Alan C penny - 17/01/2015 20:21

    Since the loading gauge for D-stock is likely to be universally capable of use on all routes currently serviced by Pacer vehicles, the concept appears a highly viable and logical re-use of bogies and aluminium bodies with a suitable power pack.

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  • Nick Davies - 04/02/2015 06:57

    I drive these trains and have done so since 1997. I went to school on them when they had guards 1980-1883. The only defect I ever had was over charging compresors. Pretty much the most reliable stock the combine has ever had. I will miss them.

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