Portal extensions' appearance on HS2 is a first for the British high-speed railway network
Innovative extensions eliminate the possibility of a ‘sonic boom’ being created by high-speed trains entering tunnels on the HS2 line at speeds of 200mph | Credits: HS2
Contractors building HS2, the UK's high-speed rail project, have completed work on a pair of innovative extensions to the southern portal of its longest tunnel to eliminate the possibility of a ‘sonic...
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