The proposed HS4Air would see tunnels going through the Surrey Hills and a train line built alongside the M25 Les Steed https://www.getsurrey.co.uk/news/surrey-news/hs4air-proposed-high-speed-rail-15001965
The proposed HS4Air would see tunnels going through the Surrey Hills and a train line built alongside the M25 Les Steed https://www.getsurrey.co.uk/news/surrey-news/hs4air-proposed-high-speed-rail-15001965