Contractors on the HS2 railway have developed unique tunnel extensions at the southern portal of the Chiltern Tunnel to mitigate the sonic boom effect caused by trains traveling at speeds up to 200mph. These extensions address the issue of 'micro pressure waves' that can create audible thuds at tunnel exits. Designed for all eight high-speed tunnels where speeds exceed 140mph, the Chiltern Tunnel extensions are particularly distinctive due to the tunnel's length and speed characteristics; making them a pioneering solution for the UK rail system.
The unique physical characteristics of the Chiltern Tunnel, accommodating trains entering at 200mph, necessitated custom solutions to mitigate 'sonic boom' effects.
Mark Howard remarked that where trains enter tunnels at speeds above 140mph, they are constructing portal extensions specifically designed to prevent sonic booms from occurring.
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