The Northolt Tunnel will run from Victoria Road in Ealing to West Ruislip in Hillingdon, carrying trains in and out of London near the new Old Oak Common
With its route map pruned, leaders in the north want other options, while in the capital, questions are growing over its Euston terminus – still a giant hole in the ground
The 2,000t tunnel boring machine (TBM) Florence, manufactured by Herrenknecht, set off on its journey from the south portal alongside the M25 in May 2021.