SR Class CP


The Southern Railway gave the designation CP to the fleet of AC electric multiple units used on the former London, Brighton and South Coast Railway lines in the Crystal Palace area.

Construction

The CP units were built in 1911-1913 to provide the electric train stock required for the LBSCR AC overhead electrification to Crystal Palace and the surrounding area. This stock comprised some 90 cars, which were used in three-car formations, usually.
Thirty motor coaches and 30 driving trailers were built by the Metropolitan Amalgamated Carriage and Wagon Co. Ltd. in 1911. Each motor coach had four Winter Eichberg motors. A further 26 driving trailers were built at the LBSC's Lancing Carriage Works. In 1912, four additional motor and trailer pairs were delivered by MAC&W's successor, the Metropolitan Carriage, Wagon and Finance Company. Lancing Works built eight more trailers the following year.
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.

Formations

The LB&SCR originally did not buy sufficient stock for 30 sets, on the grounds that the trailers cars would be quicker to overhaul than the motor cars. Fixed formations were not used, and as the Motor cars had cabs, the CP stock could be used in trains of two to six vehicles.
YearBuilderTypeLB&SCR No.SR No.
1911MAC&WDMBT3231–32608567–8595
1911MAC&WDTC4001–40309825–9854
1911LancingDTC4031–40569855–9878
1912MCW&FDMBT3261–32648597–8600
1911MAC&WDTC4061–40649881–9884
1913LancingDTC4069–40769885–9892