The station was constructed by the Great Eastern Railway on its Stoke Newington & Edmonton Railway line and opened on 22 July 1872. On 1 January 1878, the GER opened a branch line, the Palace Gates Line, from Seven Sisters station to Noel Park and later that year to Palace Gates station. The Palace Gates Line was closed by British Rail in 1963 for passengers and 1964 for freight, with the branch line track and platforms at Seven Sisters later removed. On 24 July 1967 planning permission was granted to convert the station for London Underground use. The first section of the Victoria line opened on 1 September 1968 serving Seven Sisters, although a shared entrance and interchange facilities with the surface station were not opened until December 1968. The original GER entrance to the station was situated in West Green Road at the north end of the surface station, but the new combined entrance was opened in Seven Sisters Road at the south end on the site of a former wood merchants yard, connecting to the west end of the Victoria line platforms. The original entrance was closed at that time. The National Rail platforms are not at street level. Platform 1 is accessed by twin staircases. Platform 2 has a staircase and an "up" escalator. A second entrance at the east end includes the main Victoria line ticket hall, and is accessed via subways on each side of High Road just north of the junction with Seven Sisters Road. There are three Victoria line platforms at Seven Sisters: with one platform reserved for services which terminate at the station to return to the depot or reverse back into central London, although a connection is available for trains to continue to Walthamstow Central. The section of Victoria line between Seven Sisters and Finsbury Park stations is the longest between adjacent stations in deep level tunnels on the London Underground network. During the planning phase of the Victoria line, thought was given to converting Manor House into a Victoria line station and diverting the Piccadilly line in new tunnels directly from Finsbury Park to Turnpike Lane via Harringay Green Lanes, but the idea was abandoned because of the inconvenience this would cause, as well as the cost. On 31 May 2015 the station and all services that call here, transferred from Abellio Greater Anglia to London Overground. Some Greater Anglia services are scheduled to call at this station at peak times. During summer 2015, there was no Victoria Line service between Seven Sisters and Walthamstow Central to facilitate works outside of Walthamstow station which would boost capacity along the line.
Future
In May 2013 it was announced that the station would be on the latest proposed route for Crossrail 2, with a double-ended underground station built linking South Tottenham and Seven Sisters stations.
