The English Electric Company of Great Britain capitalised on the potential for orders resulting from the British Railways (BR) 1955 Modernisation Plan to rid the UK of steam locomotives. In the following years it produced some of the most iconic and successful diesel locomotives.
The fifty Class 50 locomotives, built between 1967-1968, were the last dedicated mixed-traffic locomotive built in the UK. Upon their introduction they were used on the West Coast Main Line (WCML) to improve passenger timings on the then non-electrified portion up to Glasgow. Eighteen examples remain in existence.