British Rail Class 127 diesel trains were chosen to operate on the services from Marylebone usually to places such as High Wycombe, Aylesbury and Banbury which are on the Chiltern Main Line and Great Central Main Line (now the London to Aylesbury Line). Strangely, the 115 were under Table 115 in the British Rail timetable. They were similar to British Rail Class 127, but were superior as the class had larger windows, better seats, lights and wall surfaces. Both classes were made in the early 1960s.