When London Underground's Metropolitan line (the successor of the Met) was fully electrified in the late 1950s and early 1960s, a decision was made to run only as far as Amersham. This meant that Wendover was henceforth now only served by main line services; following the end of steam-hauled Metropolitan line trains in 1961 the service was provided by British Rail Class 115 diesel multiple units until 1992 (which were then replaced by the line's current rolling stock). Responsibility for the station (and the railway north of Amersham to Aylesbury) was transferred from London Transport to British Railways on 11 September 1961; British Railways signage gradually replaced that of the London Underground.