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Sutton & Mole Valley lines
A South West Trains EMU heads towards London
Overview
Status	Operational
Owner	Network Rail
Locale	Greater London Surrey South East England
Service
Type	Commuter rail
System	National Rail
Operator(s)	South Western Railway Southern Thameslink
Rolling stock	Class 377 "Electrostar" Class 450 Class 455 Class 458 "Juniper" Class 700 Class 701
Technical
Track gauge	1,435 mm (4 ft 8+1⁄2 in)standard gauge
Electrification	750VDCthird rail
Route map

v t e Sutton & Mole Valley lines
Legend
South London line Catford loop line Peckham Rye South London line East Dulwich North Dulwich Chatham Main Line Knights Hill Tunnel Tulse Hill Junction Tulse Hill   Crystal Palace line Leigham Tunnel Streatham Tunnel Streatham Brighton Main Line Sutton Loop Line West Croydon Mitcham Eastfields Waddon Mitcham Junction Bandon Halt Hackbridge Wallington Carshalton Carshalton Beeches Sutton Loop Line Sutton South West Main Line Epsom Downs Branch Raynes Park South West Main Line Motspur Park Cheam Chessington branch line Worcester Park Ewell East Stoneleigh Ewell West Epsom Town Epsom Ashtead M25 motorway New Guildford line Leatherhead Bookham tunnel Bookham Mickleham tunnel Effingham Junction New Guildford line Box Hill & Westhumble North Downs Line Dorking Deepdene Dorking Betchworth tunnel North Downs Line Holmwood Ockley Warnham Arun Valley line Horsham Arun Valley line

TheSutton and Mole Valley lines were constructed between 1847 and 1868 by theLondon, Brighton and South Coast Railway, theLondon and South Western Railway and the LBSCR-sponsoredHorsham, Dorking and Leatherhead Railway.

Services include commuter services inSouth London,Surrey andWest Sussex operated bySouthern, usually fromLondon Victoria toHorsham viaSutton andDorking. The South Western Railway services are operated byClass 455 trains.

The Southern services useClass 377s. Southern previously used Class 455 trains on the line until 2022, as well asClass 456 trains until 2013.South West Trains acquired the Class 456s in 2014 and re-released these trains on the line later that year, but they were withdrawn in 2022.

South Western Railway operates services betweenLondon Waterloo andLeatherhead viaRaynes Park andEpsom. Half continue along the main line toDorking, others run toGuildford viaBookham andEffingham Junction.

Thameslink operates services fromTulse Hill toSutton as part of theThameslink route toLondon Blackfriars andLuton usingClass 700 trains.

The route from Raynes Park to Horsham via Epsom and Dorking (including the Bookham Branch) is known to commuters as theMole Valley Line – seven out of the 15 stations are in theSurrey district ofMole Valley. The full titleSutton and Mole Valley Lines is used for the lines north of Epsom via Sutton. Confusingly, allSouthern services that terminate or call at Sutton are branded asSutton and Mole Valley Line services.

The lines which form the route include (in order of construction):

• The Wallington^[1][2] & Portsmouth^[1][3] lines from West Croydon to Epsom via Sutton
• The Portsmouth line^[1] from Epsom to Leatherhead
• The Epsom line^[1] from Raynes Park to Epsom
• The Portsmouth^[1] and Dorking^[4] lines from Leatherhead to Horsham via Dorking
• The Bookham Branch^[1] from Leatherhead to Effingham Junction
• The Portsmouth^[1] line from Peckham Rye to Sutton via Mitcham Junction

None of the lines leads directly to a London terminus, but services use theSouth West Main Line to accessLondon Waterloo, theBrighton Main Line to accessLondon Victoria and theBrighton Main Line (via Norwood Junction) or theSouth London Line (via South Bermondsey) to accessLondon Bridge.

The following lines are associated with the route, but are considered separate:

• The Chessington line^[1] fromMotspur Park to Chessington South
• TheEpsom Downs line^[1] fromSutton to Epsom Downs
• The St Helier line^[1] fromSutton to Wimbledon

The lines areelectrified at 750 V DC third rail.Class 455electrical multiple units are used, with semi-fast and stopping services to Horsham from London Victoria frequently operated byClass 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 theArun Valley Line &West Coastway Line.

The maximum speed is 50 mph (80 km/h), with 20 mph (32 km/h) restrictions at Clapham Junction, Streatham Junction, Mitcham Junction, Raynes Park, West Croydon, Sutton and Epsom; 30 mph (48 km/h) at Dorking and the approach to London Victoria; and 75 mph (121 km/h) 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 have been extended recently^[when?] at most stations with twelve-car length platforms at Sutton, Horsham and Dorking and ten-car platforms at most other stations including Ashtead, Ewell East and Epsom.

The lines used were the result of several schemes:

• 1847:West Croydon toSutton andEpsom railway opened by theLondon, Brighton and South Coast Railway (LB&SCR)
• 1856: Epsom and Leatherhead Railway authorised.
• 1857: Wimbledon and Dorking Railway authorised under the auspices of theLondon and South Western Railway (L&SWR), reached no further than Epsom. This is why services are run by South West Trains.
• Autumn 1857: rival schemes to connectShoreham Harbour with Horsham and Dorking. TheLondon, 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 to Epsom by the L&SWR
• 1 July 1861:Shoreham – Horsham opened
• 17 July 1862: Horsham, Dorking and Leatherhead Railway (LBSCR sponsored) authorised. Opened in two sections:^[5]

11 March 1867:Leatherhead to Dorking

1 May 1867: Dorking to Horsham

• 22 May 1865Epsom Downs Branch opened.^[6]
• 1 October 1868 The mainline route from London to Sutton viaHackbridge opened.^[7]
• 2 February 1885 Bookham branch and Guildford New Line (route via Cobham) open. Epsom and Leatherhead linked with Guildford by rail for the first time.^[8]
• 12 July 1925 Third rail electrified services begin between London Waterloo and Dorking North/Bookham and the Guildford New Line.^[9]
• July 1927 Leatherhead LSWR station closes – from 10th, all trains use LBSCR station, thanks to new spur.^[10]
• 3 March 1929 Third rail electrified services start between London Victoria and Epsom via Mitcham Jct and London Bridge and Epsom via Tulse Hill and Mitcham Jct. Epsom Town (LBSCR) station closed and services concentrated at new station on approximately the site of the former LSWR one.^[11]
• 1938 Dorking/Three Bridges to Horsham electrified. New signalling installed and new station built at Horsham. Colour light signalling through Dorking North (and new signalbox opened) from 15 May. Public third rail services start on 3 July.^[9]
• 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.
• 1997Thameslink 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.
• 2013 Platforms at intermediate stations along the route are extended to accommodate 10-coach suburban trains. Stations along the Epsom Downs branch have their platforms extended to accommodate 10-coach trains. Southern Trains introduces five car Class 377/6 on the route.
• May 2018 A new timetable comes into operation on the route affecting all services.^[12] The Epsom Downs line sees an uplift in off-peak services increasing to two trains per hour Monday to Saturday and a Sunday timetable is introduced. Also, improved connections between Epsom and West Croydon having 2 trains per hour, with the introduction of the all-day London Bridge to Epsom service.
• May 2019:Box Hill & Westhumble is now served by 3 trains per hour in each direction as South Western Railway now stop here during off peak time (previously only during the peak).

• On 4 November 1942, twoelectric multiple units collided atWaddon due to a signalman's error. Two people were killed.^[13]
• On 6 November 1947, an electric multiple unit collided with another atMotspur Park due to errors by a fogsignalman. Four people were killed and twelve were injured.^[13]

There are two tunnels, built between 1860 and 1867.

Mickleham Tunnel is midway betweenLeatherhead andBox Hill & Westhumble. It is 524 yards (479 m) long and runs through the lower chalk of Norbury Park, entering the hillside immediately north of one of the three viaducts over theRiver Mole.^[14] Restrictions imposed by the landowner,Thomas Grissell, meant that vertical ventilation shafts could not be constructed and the tunnel portals were given lavish architectural treatment.

Betchworth Tunnel is1⁄4 mile (400 m) south ofDorking. It is 385 yards (352 m) 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.^[15]

• Epsom Downs branch line
• Sutton Loop Line
• Chessington branch line
• South West Main Line
• Brighton Main Line
• New Guildford line
• North Downs Line
• Arun Valley line

Wikimedia Commons has media related toSutton and Mole Valley Lines.

• Route Map and Timetable for Sutton & Mole Valley Line

• Rail transport in Surrey
• Railway lines in South East England
• Standard gauge railways in England
• Transport in the London Borough of Croydon
• Transport in Epsom and Ewell
• Transport in the Royal Borough of Kingston upon Thames
• Transport in the London Borough of Lambeth
• Transport in the London Borough of Merton
• Transport in the London Borough of Southwark
• Transport in the London Borough of Sutton

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