London Wiki

Formerly on the North London Line, now on the London Overground. Railway station in Travelcard Zone 2 opened 1860.

The station opened in 1860 as Kentish Town on the Hampstead Junction Railway from Camden Road to Old Oak Common Junction south of Willesden Junction. It was renamed Gospel Oak in 1867 when a new station more appropriately named Kentish Town was opened about a kilometre south on the same line (that station is now Kentish Town West).

Where the two branches of the line diverge - to Barking Station and to Stratford Station

More information on the Wikipedia page [1]. The TfL page is [2]