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Chiltern tunnel

High Speed 2Railway tunnels in EnglandTunnels in BuckinghamshireUse British English from May 2021

The Chiltern Tunnel is a high-speed railway tunnel currently under construction in Buckinghamshire and Hertfordshire, England, and will upon completion carry the High Speed 2 (HS2) railway line under the Chiltern Hills. The twin-bore tunnels, which are 16.04 km (9.97 miles) long, will be the longest on the HS2 line. Each tunnel will also have additional 220 m (720 ft) entry and 135 m (443 ft) exit perforated concrete portals to reduce sudden changes in air pressure and subsequent noise.A contract for the tunnel's construction was awarded in 2017; preparatory work commenced during the following year. In May 2021, it was announced that excavation had commenced. The boring process, which is to be largely performed by a pair of tunnel boring machines (TBMs), is advancing at an average speed of 15 m (49 ft) per day; it is anticipated that it will be complete in March 2024. As of December 2023, the first TBM had excavated a total distance of 15 km (9.3 miles).

Excerpt from the Wikipedia article Chiltern tunnel (License: CC BY-SA 3.0, Authors).

Chiltern tunnel
Chalfont Lane, Three Rivers

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Wikipedia: Chiltern tunnelContinue reading on Wikipedia

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N 51.6116 ° E -0.5241 °
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Chalfont Lane

Chalfont Lane
WD3 9AE Three Rivers
England, United Kingdom
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