ČD Cargo 2025
PJM

News

filtered by: tags.tag Arup

Unique HS2 tunnel portal completed to solve high-speed rail’s ‘sonic boom’ conundrum
Unique HS2 tunnel portal completed to solve high-speed rail’s ‘sonic boom’ conundrum

Contractors building HS2 have completed work on a pair of innovative extensions to the southern portal of its longest tunnel to eliminate the possibility of ‘sonic boom’ being created by high-speed trains entering at 200 mph (321 km/h).