1971 prototype suburban EMU design which, as the BREL 1972 family, eventually encompassed 755 vehicles across Classes , , 315, and . Revenue services with Class 315 units commenced in 1980 and continued until 9 December 2022.

Description

Each Class 315 unit is formed of four vehicles; ---DMSO. Up to three units can be used together in service for a maximum 12-car formation.

Each DMSO vehicle carries four DC traction motors,

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