 London Transport reduced the A & B route between Quainton Road and Verney Junction to a single track in 1939 – 40 . LT continued to operate freight services until 6 September 1947 , when the Quainton Road – Verney Junction route closed altogether , leaving the former GCR route from Aylesbury via Rugby as the only service through Quainton Road . London Transport services were briefly restored in 1943 with the extension of the Metropolitan line 's London – Aylesbury service to Quainton Road , but this service was once more withdrawn in 1948 . 
