page_title: Elstree South tube station
section_title: Planning and construction
hierarchical_section_title: Elstree South tube station / History / Planning and construction
caption_attribution_description: Route of the unbuilt extension of the London Underground's Northern line from Edgware to Bushey Heath. The extension was planned in the mid 1930s, but construction work was postponed when World War II started and was cancelled in the early 1950s. Map shows existing Edgware station, planned route of new line, locations of proposed stations at Brockley Hill, Elstree South and Bushey Heath and the location of the new train depot at Aldenham. Road improvement schemes in the areas around Bushey Heath and Elstree South stations led to their positions being altered slightly before the project was cancelled.
context_page_description: Elstree South was a proposed London Underground station in Elstree, Hertfordshire. It was designed by Charles Holden. The planned location of the station was adjacent to the A5183, north of the junction with the A41 and where junction 4 of the M1 motorway was subsequently built.
context_section_description: 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. There was debate about the name for the station, with Elstree Hill and Elstree being proposed.
  The extension was part of the Northern Heights project which was intended to electrify a number of steam-operated London and North Eastern Railway (LNER) branch lines and to incorporate them into the Northern line. Much of the land for the extension came from the purchase in 1922 by the LPTB's precursor, the Underground Electric Railways Company of London, of the unbuilt Watford and Edgware Railway (W&ER). 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. The specific route to Bushey Heath was approved by parliament in October 1937. The LPTB's principal purpose for the extension to Elstree was to stimulate the development of new residential areas to increase passenger numbers. A secondary purpose was to provide a location suitable for a large new depot that was required to accommodate and maintain the new fleet of 1938 Stock trains to be used across the existing Northern line and the lines taken over from the LNER.
  Elstree South station was to be located in a cutting with the platforms immediately north of the portals for a pair of 1,575-foot (480 m) long tunnels through a hill towards Brockley Hill. Immediately north of the station were the junctions to the depot and a pair of depot sidings would have occupied the station cutting on the south side. The station building, designed by Charles Holden, would have had a statue of a Roman Centurion at one end reflecting, inspired by the nearby site of the Roman settlement of Sulloniacae.
  As part of the station works, the road in front of the station, Elstree Hill (now Elstree Hill South), was to be widened to 100 feet (30 m) to accommodate a planned trunk road improvement scheme for the A5 road (now renumbered the A5183 at this point).
  Construction works on the Northern Heights project began in the late 1930s but were interrupted by the outbreak of the Second World War. Most of the work undertaken to that date had been carried out on the existing LNER branch tracks but some work between Edgware and Elstree had taken place, but work between Edgware and Bushey Heath had started in June 1939. The route of the line had been cleared and laid out and some earthworks and tunnelling carried out between Edgware and Elstree South.
  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. During the war years, the LPTB-owned land was used for farming vegetables for staff canteens.
caption: Planned route of the Bushey Heath extension superimposed on a 1934 map showing the rural nature of the area
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