Operation
Passenger services are provided by Chiltern Railways. From Marylebone to Neasden Junction the track is shared with the Chiltern Main Line, and from Harrow to Amersham the track is shared with London Underground's Metropolitan Line, and is used by their "fast" services. As a result, all Chiltern trains must be fitted with the tripcock braking system to run on Underground lines. Marylebone Signalling Control Centre controls all the signals on the line between Marylebone and south of Harrow, and also from north of Amersham to Aylesbury. Marylebone can see all train movements throughout the line but does not control the signals on the Metropolitan Line section. These are operated by London Underground signal cabins at Harrow, Rickmansworth and Amersham. The Network Rail-controlled section of the line is fully equipped with ATP, the only line in Britain to have this bar the Chiltern Main Line and the Great Western Main Line. As a result all Chiltern trains must be equipped with ATP equipment.
Read more about this topic: London To Aylesbury Line
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