HS2 has started excavation of the final tunnel bore on the 140-mile railway between central London and the West Midlands – marking a significant milestone for the project.
The last of 11 tunnelling machines built for the project started its drive from Old Oak Common station in west London towards Euston – the railway’s terminus. The tunnel boring machine (TBM) is named Karen after Karen Harrison, one of the first female train drivers in the UK, who drove out of Old Oak Common depot.













