Little Missenden, Buckinghamshire, UK. 23rd April, 2026. A road sign for the HS2 compound at the newly constructed HS2 High Speed Rail Little Missenden Ventilation Shaft off the A413 in Buckinghamshire above the HS2 Chiltern Tunnels that will eventually take passengers from London to Birmingham. HS2 say "The function of the ventilation shaft and compound is to provide ventilation to control the tunnel environment, space for mechanical and electrical equipment to support the operation of the railway and an access point for emergency services". The HS2 High Speed Rail 2 project is running years

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