A concept for the ‘Concorde of the tunnelling world’ has been revealed.

   And if it ever becomes a reality, it could make high speed train travel
   from the UK to the US a reality.

--
   Liverpool, Manchester, Leeds, Newcastle and Sheffield already features
   an interconnected transport system across air, roads, ports and rail,
   including the high-speed east–west rail route dubbed HS3.

   It also includes a potential new tunnel through the Pennines to