Although, in 1948 British Railways inherited a number of multiple-units, the vast majority of which were EMUs designed for operation on the electrified networks around London, Manchester, Liverpool and Newcastle, over the next decade there was a revolution in the provision of motive power with the first-generation DMUs coming into service in large numbers and with further extensions to the Southern's electrified network requiring additional stock. This volume provides complete coverage of all types of DMU and EMU fleets.