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HS2 in Hertfordshire

HS2 in Hertfordshire
Proposed Colne Valley Western Slopes

Find out what HS2 means for Hertfordshire

The 3.6km Colne Valley Viaduct will carry the HS2 route from Harefield in Hillingdon, over the Colne Valley into Buckinghamshire, before it enters the Chiltern Tunnel South Portal in Hertfordshire.

Within Hertfordshire, infrastructure such as the Colne Valley Viaduct, the Chiltern Tunnel South Portal and the Colne Valley Western Slopes will be constructed.

Benefits at a glance

  • Capacity - HS2 will form the backbone of our rail network

    Providing much-needed rail capacity across the country, and and integrating with rail projects in the North and Midlands.

  • Connectivity - HS2 will help level-up the country

    By offering better connections HS2 will help spread jobs and opportunity around the country, driving regeneration.

  • Connectivity

    HS2 will build sustainable, climate-resilient transport infrastructure and cut carbon emissions from the UK transport sector.

What we're delivering in Hertfordshire

  • Construction

    The two-mile long Colne Valley Viaduct is being construction by Align (a joint evnture between Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick) as part of their 21.6km section.

  • Supply Chain

    More than 10 businesses in Hertfordshire are working on HS2 already. Almost two-thirds of these businesses are SMEs.

  • Community Fund

    In and around Hertfordshire, three CEF projects worth almost £358,000 have already been awarded.

Chiltern tunnel

Align JV is working on behalf of HS2 to build 22km of the high-speed rail line, running between the Colne Valley and the Chilterns.

Colne Valley Western Slopes

Integration of the HS2 rail line within the Colne Valley Western Slopes.

Colne Valley viaduct

The Colne Valley Viaduct, which will carry the new high-speed rail line for 3.4km across a series of lakes and waterways.

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Three month construction look ahead

Autumn 2021