A viaduct precast factory at the South Portal site for the Chiltern Tunnel section of the HS2 high-speed rail link is pictured on 31st January 2022 in West Hyde, United Kingdom. Two 2,000-tonne tunnel boring machines are being used to create the 10-mile Chiltern Tunnel beneath the Chiltern Hills which will be the longest tunnel on the HS2 route between London and the West Midlands.
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