The line serving the station was opened by the London and North Western Railway as part of their "New Line" project on 15 June 1912 and was first used by Bakerloo line trains on 16 April 1917. One of the generating stations supplying this network was on the site of the current London Underground depot north west of the station. The carriage shed, now without direct connection to the DC line, between Stonebridge Park station and Stonebridge Park LU depot was originally built to house LNWR stock using the DC line. The current station platforms and associated buildings were first built by the London, Midland and Scottish Railway following destruction of the original structures by bombing in World War II, the booking hall at ground level appears to be the original building. The platform-level style of the rebuilding was different from that of the original DC line stations (but not the same as the 1938 South Kenton station on the same line), utilising concrete and steel rather than brick buildings with wood and glass canopies. The 1940s buildings have themselves suffered two major fires which resulted in the rebuilding of the up side platform buildings and later the partial demolition of the down side platform building.
It is not to be confused with the nearby Harlesden (Midland) railway station (on the Dudding Hill loop line) also sometimes described as Stonebridge Park which closed in 1902 and which until recent years had remained substantially complete. The station is at a junction of the North Circular, the site of the Ace Cafe, a popular hangout for 'Rockers' in my mis-spent youth. The area is also know as Tokyngton, first mentioned in 1171, its name meaning "the farm of the sons of Toca". The station has a bridge (and little else).
Connections: London Overground. London Buses routes 112 and 440 and school route 611 serve the station.