[7] This new extension was, together with the existing tracks back to Acton Town, the first section of the Underground's surface lines to be electrified and operate electric instead of steam trains.

[7] North of the station the line crosses the Roxeth Marsh; the viaduct over it between South Harrow and Rayners Lane was an engineering feat of the time.

[7] The new station building was designed by Charles Holden as a graduated structure stepping up on each side to the platforms of the high level tracks.

The brick walls and bands of horizontal glazing are capped with a series of flat concrete slab roofs.

The 5 west facing dead ended sidings are located to the east of South Harrow and are accessed from both platforms via a pair of crossovers.

This unit was withdrawn from the Northern line after failing at Edgware and it was removed in 2004 and sent to MOD Shoeburyness for storage and scrapping.