TT3015M Class 50 GBRf Co-Co No.50049 'Defiance' Diesel LocomotiveThe Class 50 locomotives, built by English Electric at the Vulcan Foundry in Newton le Willows between 1967 1968 were the last purpose designed mixed traffic locomotive built in the UK. 50 examples were built in total. Upon their introduction they were used on the West Coast Main Line (WCML). The aim was to speed up passenger timings on the then non electrified portion up to Glasgow, and to haul express passenger trains at 100 mph. By 1974, the entire