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Tube extension to Watford Junction moves forward with industry day

Contractors are being invited to a project briefing day before tendering starts for the £80M extension of the London Underground from Croxley to Watford Junction.

The 4.5km extension to the Metropolitan Line is being promoted by Hertfordshire County Council in partnership with London Underground and Network Rail.

Under the extension plans, Watford station will be closed, with new stations at Ascot Road and Watford Hospital built in its place. Viaduct and bridge construction work alone is expected to cost more than £10M.

Consultants Mouchel and Steer Davies Gleave are working up designs, which are being developed with the aim of starting construction in spring 2014. The extended line is expected to open in 2016. Goverment funding for the scheme was confirmed in November and the project promoters submitted a Transport and Works Act application to the transport secretary Justine Greening in January. This must be approved before any work can start.

The industry day will be held on 19 April at Watford Football Club. Register by emailing

Croxley Rail Link: the scheme

The Croxley Rail Link is a proposed diversion and extension of the Watford Branch of the Metropolitan line to Watford Junction via Watford High Street. New stations will be provided on the new rail link at Ascot Road, which forms a park and ride site for the area, and Vicarage Road serving the Watford General Hospital and the  proposed Watford Health Campus development. As part of the proposals the existing Watford Metropolitan terminus station will close to passenger services. A fly through of the scheme can be viewed here.

The key elements required to deliver the Croxley Rail Link include, in summary:

  • a viaduct and embankment linking the current Metropolitan Line 1.3km south of the existing Watford terminus to the disused rail alignment between Croxley and Watford High Street;
  • reinstatement of double track on the disused Croxley alignment, including a new junction with the Watford Junction to London Euston DC route at Watford High Street;
  • work to bring the bridges, cuttings and embankments on the disused Croxley alignment into operational use;
  • provision of new substation;
  • new stations at Ascot Road and Watford General Hospital with provision of ticket gates and other requisite assets, facilities and systems; platform extensions and track layout alterations at Watford Junction;
  • alterations to traction power; an additional rolling stock unit to deliver the extended services; and possibly signalling alterations (to be confirmed).

Rolling stock, London Underground signalling, telecommunications, certain station ancillary works at both new and existing stations and provision of other relevant specific systems and services will be procured separately by London Underground.

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