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Construction Ends on Longest HS2 Tunnel Under Chilterns
The 10-mile Chiltern tunnel includes perforated ventilation extensions to prevent sonic booms and has restored nearly 20% more chalk grassland habitat, HS2 Ltd said.
- Close of work at the Chiltern tunnel vent shafts at Chesham Road and Little Missenden brings to an end a project that began almost five years ago and completes construction of HS2 Ltd's longest tunnel under the Chiltern Hills in Buckinghamshire.
- Two 2,000-tonne tunnel boring machines were launched from Maple Cross in May and June 2021, progressing north at 16 metres per day and finishing boring in February and March 2024; five ventilation and access shafts were sunk to depths up to 255.9ft.
- Excavated material from tunnelling has been repurposed to create 120 hectares of chalk grassland, while trains at 200mph take three minutes to pass through the 10-mile Chiltern tunnel with 220m long porous extensions.
- HS2 Ltd says tracks and overhead electrical equipment will be installed in later phases while civil engineering works continue elsewhere, and a new cost and timetable is due later this year after Mark Wild's review.
- The wider HS2 project has been scaled back and its timelines pushed beyond 2029–33, with HS2 Ltd assessing the London–Birmingham section at up to 66 billion in June 2024.
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HS2’s Longest Tunnel Completed: What It Means for Britain’s Infrastructure Future
In a significant engineering milestone that signals both achievement and ambition, construction has been completed on the Chiltern Tunnel, the longest tunnel in Britain’s High Speed 2 railway project. The completion of this 10-mile underground passage beneath the Chiltern Hills marks more than just another box ticked on a controversial mega-project. It represents a statement […] The post HS2’s Longest Tunnel Completed: What It Means for Britain’…
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