Although the majority of the routes served were electrified (25 kV AC overhead electrified lines on the Anglia route, 750 V DC third rail on the South Western network and dual-voltage on the North London line), diesel trains had to be used as the section of railway from Old Kew Junction to South Acton Junction — i.e.
Most of the railway routes were equipped with electricity (25 kV AC overhead electrified lines on the Anglia route, 750 V DC third rail on the South Western network and dual-voltage on the North London line), but a specific section of track necessitated the use of diesel trains from Old Kew Junction to South Acton Junction — namely.