SR Class CW

The Southern Railway (SR) gave the designation CW to the fleet of AC electric multiple units used on the lines to Coulsdon and Wallington. They were planned by the London, Brighton and South Coast Railway but were delayed by the World War I and the grouping and were introduced by the Southern Railway.

LB&SCR Coulsdon North & Sutton stock
In service1925–1929
ManufacturerMetropolitan Carriage, Wagon and Finance Company
Constructed1923–1924
Number built101 vehicles
Formation5-car sets: DTT-DTC-MLV-TC-DTT
Operator(s)Southern Railway
Specifications
Car lengthMLV: 42 ft 1 in (12.83 m)
WeightMLV: 62 long tons (63 t; 69 short tons)
Power output1,000 hp (750 kW)
TransmissionFour GEC traction motors of 250 hp (186 kW)
Electric system(s)6.7 kV AC overhead lines
Current collection methodBow collector
Track gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge

Construction

The CW (Coulsdon and Wallington stock) units were built in 1923–1924, as the last electric train stock for use on the LBSCR AC overhead electrified lines in South London. This stock comprised some hundred carriages, which were used in five-car formations: Driving Trailer Third (DTT) + Driving Trailer Composite (DTC) + Motor Luggage Van (MLV) + Trailer Composite (TC) + Driving Trailer Third (DTT).

The stock, built by the Metropolitan Carriage, Wagon and Finance Company at Birmingham, was as follows:

  • 21 Motor Luggage Vans
  • 60 Driving Trailers
  • 20 Trailers

The Motor Luggage Vans (nicknamed "Milk Vans") each had four 250 horsepower (190 kW) GEC traction motors.

After the replacement of the AC overhead equipment by the 660 V DC third rail system adopted as standard by the SR, the carriages that formed these units were rebuilt accordingly, the Motor Luggage Vans becoming bogie goods train brake vans.

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References
  • Gould, David (1995). Bogie Carriages of the London, Brighton and South Coast Railway. Headington, Oxford: The Oakwood Press. pp. 168–190. ISBN 0-85361-470-9.
  • Marsden, Colin J. (1983). Southern Electric Multiple-Units 1898–1948. Shepperton, Surrey: Ian Allan Limited. pp. 11–13, 92. ISBN 0-7110-1253-9.
  • Golding, Brian (2009). A Pictorial Record Of Southern Electric Units. Corhampton, Southampton: Noodle Books. ISBN 978-1-906419-34-9.


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