HS2 completes first Chiltern Tunnel cross passages

The construction of HS2’s longest tunnels stretching for 10 miles under the Chilterns has begun a new phase with the start of work on thirty-eight cross passages linking the north and southbound tunnels.

The Chiltern tunnels will carry high speed trains between London and the North at speeds of up to 200mph (320km/h). The trains will travel through two parallel tunnels linked by short passages for use in emergencies.

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