 Repairs to the class were undertaken at Crewe , Swindon and Doncaster Works until the financial constraints of the British Railways Modernisation Plan in terms of expenditure on steam began to preclude the regular overhaul of locomotives . During the mid @-@ 1960s overhauls were carried out exclusively at Crewe Works . The first locomotive to be withdrawn from service was number <unk> " Coeur @-@ de @-@ Lion " in 1965 , and the entire class was gradually transferred to Carlisle Kingmoor and Glasgow Polmadie depots as steam was displaced by the dieselisation of British Railways . A succession of bulk withdrawals began in 1967 , and the last , of number 70013 " Oliver Cromwell " , took place in 1968 , at the very end of steam operation in Britain . Subsequently that locomotive was selected to represent the class in the National Collection . Only 70000 " Britannia " , which was privately preserved , saw main line service during the preservation era – until 2008 , when 70013 " Oliver Cromwell " ' s restoration was completed , and she worked part of the " 15 Guinea Special " – a special train run to commemorate the final BR steam working in 1968 . 70013 is now to be found operating main line railtours over the Network Rail system . 
