peak service in trains per hour (tph) presently consists of: 4tph to Aldgate (fast) 2tph to Aldgate (semi-fast) 4tph to Amersham 2tph to Chesham The evening peak service in trains per hour (tph) presently consists of: 2tph to Baker Street (all stations) 4tph to Aldgate via Baker Street (all stations) 4tph to Amersham 2tph to Chesham Chiltern Railways Chiltern Railways operate services between Aylesbury Vale Parkway via Amersham and Aylesbury and London Marylebone via Harrow on the Hill. All Chiltern Railway services run non stop between Rickmansworth and Harrow on the Hill and Harrow on the Hill and London Marylebone. The off-peak service in trains per hour (tph) presently consists of: 2tph to London Marylebone 1tph to Aylesbury 1tph to Aylesbury Vale Parkway via Aylesbury References External links Metropolitan line stations Tube stations in Hertfordshire Railway stations in Three Rivers District Former Metropolitan and Great Central Joint Railway stations Railway stations in Great Britain opened in 1889 Railway stations served by Chiltern Railways