The electro-diesel locomotives and multiple units used by the Southern Region of British Railways, were unique to this region. The locomotives of class 73 were used extensively throughout the region, in particular on Gatwick Express services, as well as on departmental and track recording trains. Their versatility in being able to work off 3rd rail electricity as well as diesel engined power gave them unrivalled areas of work. The class 74s, which only had a short life, were seen particularly on boat trains and parcels services on the South Western main line. The classes 201-3 were 6-car units of narrow bodied construction, so as to be able to work Hastings line services with its restricted clearances. The other classes 204-207 were 3-car units employed on stopping services throughout the region, but especially in Hampshire and the lines to Uckfield and originally East Grinstead. They were also seen on services in East Sussex and Kent.