A new, larger western entrance by Wells Terrace and Goodwin Place opened in December 2019, as part of the upgrade of the station.

[10][11] Finsbury Park is on the route of the East Coast Main Line from King's Cross to the north of England and Scotland.

[17] The tube railway originated as the Great Northern and Strand Railway (GN&SR) in 1899 and was initially supported by the GNR as a means of relieving congestion on its main line into King's Cross by constructing a tube line under the GNR's tracks from Alexandra Palace to King's Cross and then to the Strand.

[18] The GN&SR was taken over in 1901 by a consortium led by Charles Yerkes before any work had been carried out and the section north of Finsbury Park was cancelled.

[20] The transport interchange at Finsbury Park had long been recognised as a severe bottle-neck for passengers heading north from central London and calls had been regularly made to improve the situation by extending northwards one of the two underground lines serving the station.

With financial support from the government, the Underground began construction of an extension of the Piccadilly line northwards to Cockfosters and the first section, to Arnos Grove, opened on 19 September 1932.

In early 1939 London Underground announced that the Drayton Park to Alexandra Palace route would begin operation in autumn 1940 and the branch was transferred to the control of the Northern line.

The start of the Second World War caused the postponement and eventual cancellation of this and much of the other plans, leaving operations at Finsbury Park unchanged.

To allow the construction works necessary for the provision of cross-platform interchanges between the Piccadilly and the Victoria lines the Northern City service to Finsbury Park was ended on 3 October 1964.

There are cross-over connections between each pair of northbound and southbound tunnels to enable stock transfers, given that the Victoria line is otherwise completely self-contained.

[citation needed] The first section of the Victoria line, including Finsbury Park, opened between Walthamstow Central and Highbury & Islington on 1 September 1968.

[25] When the Victoria line was built in the 1960s, the walls in Finsbury Park station were decorated with mosaics of duelling pistols,[26] which can still be seen.

[27] At the same time the long entrance subways and the Wells Terrace booking hall (at the bus station end) were rebuilt to a high standard.

[citation needed] London Underground continued to use the Edgware branch occasionally for stock movements between its depot at Highgate and Finsbury Park until September 1970.

The tracks were removed in 1971 and the platforms at Finsbury Park which served this line were demolished; their location is now the pedestrian access to the eastern station entrance.

[28][29] Step free access to both the Piccadilly and Victoria lines, as well as to platforms 1&2 and 5&6 of the National Rail station was completed in January 2019.

This has enabled through services to run from Cambridge and Peterborough via Finsbury Park and London Bridge to Gatwick Airport, Horsham and Brighton.

During the week, and on Saturdays, there are currently four trains an hour off peak in each direction through the core to/from Finsbury Park; two to/from Peterborough to Horsham and two to/from Brighton to Cambridge.

In February 2008 Network Rail published its East Coast Main Line Route Utilisation Strategy (ECMLRUS).

Access to the Piccadilly and Victoria line platforms was previously by staircase only, reached via two narrow passages that prevented the installation of ticket barriers.