The 558ft long contraption will dig a 10-mile tunnel under the Chiltern Hills, starting from a site in Buckinghamshire near the M25..
High Speed 2
UK high speed railway under construction
High Speed 2 (HS2) is the second purpose-built high-speed railway system in the United Kingdom. The first is the 108-kilometre (67 mi) High Speed 1 (HS1), which connects London to the Channel Tunnel and was opened in the mid-2000s. The 176-kilometre (109 mi) first phase is under construction. With a "Y"-shaped network of track and a design speed of 400 km/h (250 mph), the new railway will link London, Birmingham, Manchester and Leeds.