Elstree South tube station

The station was the second of three planned by London Passenger Transport Board (LPTB) in 1935 for an extension of the Northern line from Edgware to Bushey Heath.

The W&ER had planned an extension of the Edgware, Highgate and London Railway to Watford Junction via Bushey, but it had never raised the capital required and its powers to construct a line had expired in 1911.

[4] The LPTB's principal purpose for the extension to Elstree was to stimulate the development of new residential areas to increase passenger numbers.

[13] Construction works on the Northern Heights project began in the late 1930s but were interrupted by the outbreak of the Second World War.

[14][n 4] Following the outbreak of war in Europe, work on the extension was suspended in September 1939 and was formally terminated in December of the same year as wartime funding restrictions would prevent completion.

Planned route of the Bushey Heath extension superimposed on a 1934 map showing the rural nature of the area
How Elstree South station might have appeared on the London Underground Map if the Northern line extension from Edgware to Bushey Heath and Mill Hill East had been built