United Kingdom · Question · Written question
UIN 11820
High Speed 2 Line: Tunnels
Introduced
22 June 2026
Last action
1 July 2026 · Answer
Status
Answered
Sponsors
—
Subjects
Discovery layer
Source updated
1 July 2026
Summary
To ask the Secretary of State for Transport, with reference to the HS2 six-monthly report to Parliament published in May 2026, what lessons learned and innovative construction methods were deployed in the completion of the north portal structure at the Ch
This text is taken from the official record. PoliticalRepo does not editorialize.
Timeline
22 June 2026
Written question
To ask the Secretary of State for Transport, with reference to the HS2 six-monthly report to Parliament published in May 2026, what lessons learned and innovative construction methods were deployed in the completion of the north portal structure at the Ch
Source: Commons
1 July 2026
Answer
The Chiltern Tunnel North and South Portals have been specially engineered with perforated concrete hoods to prevent the possibility of sudden changes in air pressure and a resulting ‘sonic boom’ caused by trains entering and exiting the 10-mile-long tunn...
Source: Written answer
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- · Department for Transport · Answering body
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Sources
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- Official source: https://questions-statements.parliament.uk/written-questions/detail/2026-06-22/11820
- Open data entity: https://questions-statements-api.parliament.uk/api/writtenquestions/questions/1918799
- uk · wq-1918799 · source updated 1 July 2026