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| Side view of an M Stock DM [2] |
| Information for M Stock | |
|---|---|
| Number built: | 58 (Carriages) |
| Built: | 1898-1900 (Conversions 1906) |
| Builder: | Ashbury Railway Carriage & Wagon Company (Conversions) British Thomson-Houston |
| Motor: | 4 GE69 electric motors per power car (600v DC fourth rail) |
| Power: | 1, 600 hp (1, 194 kW) |
| Formation: | Driving Motor (DM) + Trailer (T) + T + T + T + T + DM |
The first conversions were 4-car rakes converted in 1906. They were initially found to be underpowered and were retro-fitted with more powerful motors. These cars, later in 6-car rakes, were known as N Stock and were later used on the Metropolitan Stanmore branch.
Also created were 7-car rakes with GE69 motors [2], two motors apiece on each bogie on the Driving Motor. These M Stock trains were later strengthened to 8-car rakes. Behind the cab in each Driving Motor the former guard and luggage compartment became an equipment area containing switching and other control electrical apparatus which took up about a third of the coach [3].
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| M Stock on test [2] |
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| GE69 electric motor [2] |
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| Equipment area behind the driver's seat in the cab [2] |
[1] Piers Connor, The London Underground Electric Train (Crowood Press, 2015) p. 135
[2] "Converted coaches on the Metropolitan Railway", The Electrician (Oct 12 1906) p. 1004
[3] Oliver Green, The London Underground. An Illustrated History (Ian Allan, 1987) p. 26