The Redhill–Tonbridge line is a railway line in South East England. It runs from the Brighton Main Line at in Surrey to the South Eastern Main Line at in Kent. There are five intermediate stations: , , , and . All passenger services run as all-stations shuttles between Redhill and Tonbridge, and are operated by Southern using Class 377 electric multiple units.
The route was opened by the South Eastern Railway in 1842 as part of the London to Dover main line. Since it was to be used primarily by express services, the line was engineered with few curves to allow high-speed running. At the time of construction, east Surrey and west Kent were sparsely populated and most of the intermediate stations are some distance from the settlements they purport to serve. In 1868, following the opening of the new main line via and , which provided a shorter route from the capital, the Redhill–Tonbridge line was downgraded to secondary status. The line became part of the Southern Railway in 1923 and was incorporated into the Southern Region of British Railways in 1948.
Steam-hauled trains were withdrawn from the Redhill–Tonbridge line in 1965, when diesel multiple units were introduced. The new timetable consisted of an hourly service between and Tonbridge via Redhill. From 1989, these trains were branded as "North Downs" services. In 1994, the line was electrified using the 750 V DC third-rail system, to provide a diversionary route for Channel Tunnel traffic. A new service between and Kent was introduced, operated by electric multiple units, which replaced the diesel service from Reading. In 1995, trains running to-and-from London via were added.
At privatisation in 1996, responsibility for the Redhill–Tonbridge line was transferred to Connex South Eastern. The company was stripped of its franchise in 2003 and operations were passed to the publicly owned South Eastern Trains. On 1 April 2006, the line was taken over by London & South Eastern Railway as part of the Integrated Kent Franchise, but in 2008, Southern assumed responsibility for all operations. Southern withdrew the Gatwick services that year and trains to-and-from London were discontinued in 2018, establishing the current shuttle service between Redhill and Tonbridge.
Route Infrastructure The Redhill–Tonbridge line is a standard-gauge railway line in Surrey and Kent, England. It runs for from the Brighton Main Line at to the South Eastern Main Line at . The line is electrified using the 750 V DC third-rail system and is double track throughout. Between Redhill and , the line is controlled by Three Bridges Area Signalling Centre and from Godstone to Tonbridge by Ashford Integrated Electrical Control Centre. With the exception of the Godstone– section, which uses the absolute block method, the signalling system uses track circuits. The maximum permitted speed on the line is and there are speed restrictions on the approaches to Redhill and Tonbridge stations.
The underlying geology for the majority of the line is Weald Clay, but to the west of the line is on Tunbridge Wells Sand. The line descends from Redhill to Tonbridge and the steepest gradient, to the west of Edenbridge, is 1 in 240. The M23 motorway and A21 dual carriageway cross over the line on the Coopers Hill and Medway Viaducts respectively. There are two tunnels, the longest of which is the Bletchingley Tunnel between and Godstone. Between Penshurst and , the route runs through the Penshurst Tunnel and crosses the watershed between the Rivers Eden and Medway. The main channel of the Medway is bridged via a six-arch viaduct, the footings of which were strengthened in the early 1980s as part of the Medway Flood Relief Scheme. The line passes through several areas that are prone to flooding, including the river valley between Leigh and Tonbridge.
Since it was built as part of the London–Dover main line, the route was engineered for high-speed running. The sharpest curve, of radius , is immediately to the southeast of Redhill, where the line diverges from the Brighton Main Line. The only other significant curve is to the west of Edenbridge station and has a radius of . The Redhill–Tonbridge line crosses over the and branches of the Oxted line, but there are no direct interchanges between them. The bridge over the Uckfield branch is positioned near the mid-point of Edenbridge Tunnel (also known as Little Browns Tunnel), which opens out briefly at the crossing point. The Redhill–Tonbridge line also passes over Redhill Tunnel, part of the Quarry line that enables express services on the Brighton Main Line to bypass the junctions at Redhill station.
The pedestrian level crossing at Medhurst Row, between Edenbridge and Penshurst, also provides private vehicle access for local landowners and permission to cross must be sought from the signaller by telephone. There is a speed restriction of on both tracks on the approaches to the Medhurst Row crossing. To the west of Tonbridge station are the Jubilee Sidings, used to stable electric multiple units, and the adjacent Tonbridge West Yard, operated by GB Railfreight. Other freight operators using the line include DB Cargo, Freightliner and Colas Rail.
Stations and services There are seven stations on the line: Redhill, Nutfield, Godstone, Edenbridge, Penshurst, Leigh and Tonbridge. All stations are managed by Southern, with the exception of Tonbridge, which is managed by Southeastern. The intermediate stations have two platforms each and the two termini have four platforms. Since the line was built for express services, serving the then sparsely populated areas of east Surrey and west Kent was a secondary concern and the majority of the intermediate stations are some distance from the settlements for which they are named: Godstone station is around south of Godstone village and Penshurst station is in the hamlet of Chiddingstone Causeway, around north of Penshurst itself.
All passenger services on the Redhill–Tonbridge line are operated using Class 377 electric multiple units. Since 2022, the timetable has consisted of an hourly, all-stations service between Redhill and Tonbridge, supplemented with additional services at peak times. The typical journey time between Redhill and Tonbridge is around 30–35 minutes. Since December 2023, two units have been required to operate the weekday timetable. Although Southern provides the rolling stock, the drivers and guards working services on the line are employed by Southeastern.
Stations on the Redhill–Tonbridge line StationDistance from Charing Cross via Norwood JunctionNumber of platformsOpening date Original nameRef.4(relocated 15 April 1844)Reigate22 2Eden Bridge22Leigh Halt4 (2 for Redhill trains)Tunbridge
History Proposals and authorisation
The earliest formal proposal for a railway line linking London and Dover via Tonbridge was advanced in October 1835. The route, surveyed by the former Royal Engineer, Captain John Pringle, and the architect, Decimus Burton, was to run from the London and Croydon Railway (L&CR) terminus at via Oxted, Godstone and Tonbridge. Although the parliamentary committee scrutinising the plans was sceptical of the cost estimates for the embankments and tunnels required, the South Eastern Railway Act was passed on 21 June 1836. It authorised the company to acquire capital of £1.4 million (equivalent to £ million in ) and awarded borrowing powers of up to £450,000 (£ in ).
The first board meeting of the South Eastern Railway (SER) took place on 2 July 1836, chaired by Pascoe St Leger Grenfell. The board had intended to appoint Henry Palmer as company engineer, but he declined owing to ill health and William Cubitt was appointed instead. Cubitt recommended that the junction between the L&CR and the SER should be further north than that proposed by Pringle and Burton. The board agreed Cubitt's suggested alterations and construction work began at Riddlesdown on 11 March 1837. The act of Parliament authorising the changes to the route was given royal assent on 3 July 1837.
Less than two weeks later, on 15 July 1837, the act of Parliament authorising the London and Brighton Railway (L&BR) was passed. This line would also branch from the L&CR in the Croydon area and would run via Redhill and Haywards Heath to the south coast. Since the SER and L&BR would run alongside each other between Norwood and , the act gave the two companies permission to share a single pair of tracks to avoid duplication. Furthermore, the SER was given the ability to branch from the L&BR at any point north of Earlswood, Surrey. The possibility of sharing part of the L&BR line appealed to the SER, which was experiencing financial difficulties. William Cubitt was instructed to cooperate with Joseph Gibbs, the L&BR engineer, and to explore potential route changes that might result in cost savings. Agreement was reached in November 1838 for the SER to branch from the L&BR at Redhill and the revised plan was approved by act of Parliament on 19 July 1839.
Construction and opening
Construction of the Redhill–Tonbridge section of the SER began at Tonbridge under the supervision of Peter Barlow. Materials were delivered via the River Medway Navigation and rails had been laid as far as Edenbridge by 20 November 1841. The works at Bletchingley Tunnel were supervised by Frederick Walter Simms, who wrote a detailed account of the construction in his book, Practical Tunnelling, published in 1844.
The Redhill–Tonbridge line was the first section of the SER to open on 26 May 1842. Five stations opened with the line: Redhill (then called "Reigate"), Godstone, Edenbridge, Penshurst and Tonbridge (then spelled "Tunbridge"). The initial service was four trains per day in each direction, increased to six once the line had been extended to on 31 August. The section to opened on 1 December 1842. Initially the revenue generated was disappointing, but the SER anticipated that passenger numbers would rise once the railway began serving the channel ports. The service was increased to seven trains per day in each direction following the opening of Folkestone Central station on 28 June 1843. The SER was completed to Dover on 7 February 1844.
The first major alteration to be made to the line was the relocation of Redhill station in 1844. Originally called "Reigate" and sited on Hooley Lane, it was resited to allow better interchange with LB&SCR services to-and-from . SER trains began using the new station in April 1844. Redhill shed was opened by the SER in 1855. It not only provided locomotives for the line via Tonbridge to Dover, but also for the Reading, Guildford and Reigate Railway, which had opened in 1849 and had been purchased by the SER in 1852.
Late 19th century Within a few years of the opening of their main line from London to Dover, the SER began to consider building a more direct line between the capital and Tonbridge to reduce journey times and to avoid conflict with the LB&SCR north of Redhill. The first proposal, surveyed by the engineer Samuel Morton Peto, was presented to Parliament in January 1845, but did not gain approval. In 1859, the line linking Swanley to Sevenoaks, proposed by the Sevenoaks Railway company, was authorised. The SER, fearing further encroachment into its territory from rivals, decided to revive its proposal for a "cut off" line. The "Direct Tonbridge" route, as the new main line was initially known, was authorised on 30 August 1862 and opened in stages in the first half of 1868. On 1 June of that year, most express services were routed along the new line and the Redhill–Tonbridge line was reduced to secondary status.