 Watkin continued to harbour ambitions of linking his railway companies in the north and south of England , and while the construction of the Rickmansworth extension was underway planned two possible routes north from Rickmansworth across the Chilterns . One proposal envisaged the MR taking over or reaching agreement with the Aylesbury and Buckingham Railway , building a link between Rickmansworth and Aylesbury , and running over the A & B 's line to the north . The A & B had close relations with the Great Western Railway , with whom they shared a station at Aylesbury . Watkin felt it possible that the A & B would reach agreement with the GWR instead and not cooperate with the MR. 
