Tags: Chiltern Tunnels

HS2 celebrates as longest tunnels reach halfway point under the Chilterns

HS2 Ltd confirmed that ‘Florence’ and ‘Cecilia’, the two giant tunnelling machines excavating the high speed rail project’s longest tunnels, have passed the halfway point on their 10 mile journey under the Chilterns. The enormous 2,000 tonne machines have spent the last 18 months excavating the twin tunnels between the M25 and South Heath in […]