From the longer Wikipedia page 
Primrose Hill was a railway station at Primrose Hill, in the London Borough of Camden, London.
It was opened on 5 May 1855 as Hampstead Road, replacing an earlier station of that name (opened 9 June 1851). It was renamed Chalk Farm on 1 December 1862 and became Primrose Hill on 25 September 1950. The station closed on 28 September 1992.
It has been proposed to re-open Primrose Hill station by bringing the short stretch of line between South Hampstead Station and Camden Road Stations back into the regular passenger service by incorporating it into the London Overground network.