 On 26 March 1889 the 3rd Duke of Buckingham and Chandos died , aged 65 . By this time the construction of the MR extension to Aylesbury was well underway , and on 1 July 1891 the MR formally absorbed the A & B. Sir Harry Verney died on 12 February 1894 , and on 31 March 1894 the MR took over the operation of the A & B from the GWR . On 1 July 1894 the MR extension to Aylesbury was completed , giving the MR a unified route from London to Verney Junction . The MR embarked on a programme of upgrading and rebuilding the stations along the newly acquired line . 
