Both systems commenced operations on 20 June 1911.[1][2] However, the public service on the Bradford system did not start until four days later.[1][2] The Bradford system lasted the longest of all the UK's urban trolleybus systems.[2] Having been one of the first two such systems to open, it was also the last one to close, on 26 March 1972.[1] Just before its closure, it was also the longest-lived surviving trolleybus system in the world, but with the Bradford closure that distinction passed to the Shanghai, China, trolleybus system, opened in 1914.[3]
Brearley, Harold (1960). A History of Bradford Trolleybuses. Lingfield, Surrey, UK: Oakwood Press.
Brearley, Harold (1961). History of Bradford Trolley Buses, 1911-1960. Lingfield, Surrey, UK: Oakwood Press.
King, John Stanley (1972). Transport of delight: the Bradford trolleybus, 1911-1972. Guildford, Middlesex, UK: National Trolleybus Association. ISBN978-0-85024-005-4.
Lockwood, Stephen (2003). Bradford Trolleybuses. Midhurst, West Sussex, UK: Middleton Press. ISBN978-1-904474-19-7.
Lumb, Geoff (2003). Bradford and its Trolleybuses. Colour Prestige series, no. 2. Glossop, Derbyshire, UK: Venture Publications. ISBN978-1-898432-94-4.
Stainforth, J. A. L. (1974). The Bradford trolleybus system: being the history of Britain's first and last trolleybuses. Huddersfield, Yorkshire, UK: West Riding Transport Society. ISBN978-0-905043-00-5.
Uden, M J (1971). Sixty years of Bradford Trolleybuses. Surrey, UK: National Trolleybus Association. ISBN9781904474197. OCLC219881275.