HS2 reveals final design for last of seven key Chiltern Tunnel structures

HS2 has revealed the final designs for the North Portal of the Chiltern Tunnel, which forms part of the UK’ largest infrastructure project – the last of seven key structures for the high speed rail project’s longest tunnels.

HS2 Chilterns tunnel north portal view looking south

24 March 2023
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Once construction is complete, the seven key design elements will be the only parts of the tunnel visible to the local community.

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