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