The line to Aylesbury Vale Parkway via Amersham runs alongside London Underground's Metropolitan Line between Finchley Road) and Harrow-on-the-Hill, with each operator running on separate tracks, then shares the tracks with Metropolitan Line services.
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Chiltern Railways operates services on the Chiltern Main Line from London Marylebone to Aylesbury, Stratford-upon-Avon and Birmingham Snow Hill with some peak-hour services to Kidderminster.
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