 After Watkin 's retirement from management , relations between the MR and GCR deteriorated rapidly over shared use of Baker Street station and the congested route into London , and soon broke down completely . On 30 July 1898 John Bell , General Manager of the Metropolitan Railway , took control of the Quainton Road signal box himself and refused to allow a GCR train onto MR @-@ owned tracks on the grounds that it was scheduled to take the Great Western rather than the Metropolitan route south of Aylesbury , while on one occasion in 1901 King Edward VII was travelling home after visiting a friend in Wendover ; the MR signalman allowed a slow goods train to run in front of the royal train , causing the King to arrive late back in London . The MR management also refused the GCR permission to install points to connect their engine shed at Aylesbury to the railway line , on the grounds that the land for the shed had been bought clandestinely . Eventually a parallel set of tracks was built for the GCR between Harrow and London , running alongside the MR to a separate terminus at Marylebone , a short distance from Baker Street . The GCR continued to share the less @-@ congested section between Quainton Road and Harrow — including Chalfont Road station — with the MR. 
