Sutton and Mole Valley Lines

The Sutton & Mole Valley Lines were constructed between 1847 and 1868 by the London, Brighton and South Coast Railway, the London and South Western Railway and the LBSCR-sponsored Horsham, Dorking and Leatherhead Railway.

Services
Services include commuter services in south London, Surrey and West Sussex operated by Southern, usually from London Victoria to Horsham via Sutton and Dorking. Some Southern services in peak hours from London Bridge call at West Croydon and diverge at Leatherhead and serve Effingham Junction and Guildford via the New Guildford Line. The South West Trains services are operated by Class 455/8. The Southern services use that same type of train, but sometimes Class 377 or 456 instead.

South West Trains operates services between London Waterloo and Leatherhead via Raynes Park and Epsom. Half continue along the main line to Dorking, others run to Guildford via Bookham and Effingham Junction.

First Capital Connect operates services from Tulse Hill to Sutton as part of Thameslink to London Blackfriars and Luton.

Technical information
The line from Raynes Park to Horsham 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 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 London Waterloo, the Brighton Main Line to access London Victoria and the Brighton Main Line (via Norwood Junction) or the South London Line (via South Bermondsey) to access London Bridge.
 * West Croydon to Epsom via Sutton
 * Epsom to Leatherhead
 * Raynes Park to Epsom
 * Leatherhead to Horsham via Dorking
 * Leatherhead to Effingham Junction (Bookham Branch)
 * Peckham Rye to Sutton via Mitcham Junction

The following branch lines are associated with the lines, but are considered separate:
 * Motspur Park to Chessington South (Chessington Branch)
 * Sutton to Epsom Downs (Epsom Downs Branch)
 * Sutton to Wimbledon (Wimbledon Loop)

The lines are electrified at 750 V DC third rail. Class 456 and Class 455 electrical multiple units are used, with semi-fast and stopping services to Horsham from London Victoria frequently operated by Class 377 Electrostars. Up to the early 1980s, express services to Littlehampton and Bognor Regis were routed along these lines and called at Sutton, Dorking, Horsham and stations to the south coast along the Arun Valley Line & West Coastway Line.

The maximum speed is 50 mph, with 20 mph restrictions at Clapham Junction, Streatham Junction, Mitcham Junction, Raynes Park, West Croydon, Sutton and Epsom; 30 mph at Dorking and the approach to London Victoria; and 75 mph between Box Hill and Westhumble and Dorking, and between Dorking and Holmwood. Signalling between London Victoria and Ewell East (including the Epsom Downs Branch) is controlled by London Victoria (VC); between London Waterloo and Box Hill and Westhumble by Wimbledon (W); between Box Hill and Westhumble and Warnham by Dorking (CBK); and between West Croydon & Waddon and Warnham & Horsham by Three Bridges Signalling Centre (T).

Platform lengths are eight cars except for Sutton,Leatherhead, Ashtead, Dorking and Horsham, 12 cars.

History of the route


The lines used were the result of several schemes:
 * 1847: West Croydon to Sutton and Epsom railway opened by the London, Brighton and South Coast Railway (LB&SCR)
 * 1856: Epsom and Leatherhead Railway authorised.
 * 1857: Wimbledon and Dorking Railway authorised under the auspices of the London and South Western Railway, reached no further than Epsom. This is why services are run by South West Trains.
 * autumn 1857: rival schemes to connect Shoreham Harbour with Horsham and Dorking. The London, Brighton and South Coast Railway (LBSCR) was eventually successful, on 1 August 1859.
 * 1 February 1859: Epsom and Leatherhead Railway opened
 * 4 March 1859: Wimbledon and Dorking Railway opened
 * 1 July 1861: Shoreham - Horsham opened
 * 17 July 1862: Horsham, Dorking and Leatherhead Railway (LBSCR sponsored) authorised. Opened in two sections:
 * 11 March 1867: Leatherhead to Dorking
 * 1 May 1867: Dorking to Horsham


 * 1865 Epsom Downs Line opened.
 * 1868 The mainline route from London to Sutton via Hackbridge opened.
 * 1901 London Victoria to Sutton via Norbury electrified at 6,600 V AC
 * 1938 London - Horsham electrified at 660 V DC and new signalling installed.
 * 1978 Portsmouth Harbour/Bognor Regis express services diverted via Gatwick Airport, and the lines downgraded including the removal of the passing loops at Cheam. A peak hour service continues, stopping at Sutton and Dorking.
 * 1984 Dorking and Sutton lose their peak hour 12-coach fast trains to London and the south coast.
 * 1997 Thameslink 2000 is announced with promises of a King's Lynn to Guildford service via London Bridge and West Croydon and an upgraded Wimbledon loop service to St Albans, with 12-coach trains.

Tunnels
There are two tunnels, built between 1860 and 1867.

Mickleham Tunnel is midway between Leatherhead and Box Hill & Westhumble. It is 524 yards long and runs through the lower chalk of Norbury Park, entering the hillside immediately north of one of the three viaducts over the River Mole. Restrictions imposed by 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 1/4 mile south of Dorking. It is 385 yards long with a maximum gradient of 1 in 80. 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.

Typical off-peak journey times from London Victoria to Horsham via Mitcham Junction
Based on the May - December 2006 timetable.

South West Trains, First Capital Connect and Southern run additional services along parts of this line.

Typical off peak journey times from London Victoria to Epsom Downs via West Croydon
Based on the May - December 2006 timetable.

Southern run additional services between London and West Croydon branded as "Metro".

The line between West Croydon and Sutton has six trains an hour off peak and four trains an hour during the peak unlike other stations further up the line.