Sutton and Mole Valley lines via Epsom and Dorking (including the Bookham Branch) is known to commuters as the "Mole Valley Line" – seven out of the 15 stations are in the Surrey district of Mole Valley. The full title "Sutton and Mole Valley Lines" is used for the lines north of Epsom via Sutton. Confusingly, all Southern services that terminate or call at Sutton are branded as "Sutton and Mole Valley Line" services. The lines which form the route include (in order of construction): None of the lines leads directly to a London terminus, but services use the South Western Main Line to access
Sutton and Mole Valley lines the landowner, Thomas Grissell, meant that vertical ventillation shafts could not be constructed and the tunnel portals were given lavish architectural treatment. Betchworth Tunnel is south of Dorking. It is long with a maximum gradient of 1 in 80 (1.25 per cent). It runs through the upper greensand of the Deepdene Ridge to the east of the town. Construction difficulties delayed the opening south of Dorking. It collapsed on 27 July 1887, remaining closed for over six months. Sutton and Mole Valley lines The Sutton and Mole Valley lines were constructed between 1847 and 1868 by the London, Brighton and