British Rail Class 313

The British Rail Class 313 is a class of dual-voltage electric multiple units for suburban and regional passenger services, built by British Rail Engineering Limited at Holgate Road carriage works between February 1976 and April 1977. They were the first production units derived from British Rail's 1971 prototype suburban electric multiple unit design, the BREL 1972 family that grew to 755 vehicles over five classes: 313, 314, 315, 507 and 508. They were the first second-generation electric multiple units built for British Rail, and carried both a pantograph for 25 kV 50 Hz overhead supply and contact shoe equipment for 750 V DC third rail supply. Before their withdrawal in 2023 the Class 313 units were the oldest electric multiple units operating on the National Rail network in Great Britain, having entered service in 1976.