Northolt tunnel is the second longest tunnel on the Phase One route. The tunnel will carry passengers from Old Oak Common station 8.4 miles under London to West Ruislip. We will need four tunnel boring machines to build this tunnel and when they finish, they will be extracted at Green Park Way vent shaft.
The Euston tunnel is a 4.5 mile tunnel that will take passengers from Euston station to Old Oak Common station. The tunnel will be built using two tunnel boring machines. They will start tunnelling at Old Oak Common and work their way towards Euston.