The London Overground (also known simply as the Overground) is a suburban rail network serving London and some of its northern environs. Established in 2007 to take over Silverlink Metro routes, it now serves a large part of Greater London as well as Hertfordshire, with 113 stations on the six lines that make up the network.
The Overground forms part of the United Kingdom's National Rail network but it is under the concession control and branding of Transport for London (TfL). Operation has been contracted to First Rail London since May 2026. TfL previously assigned orange as a mode-specific colour for the Overground in branding and publicity including the roundel, on the Tube map, trains and stations. In 2024, each of the six Overground lines were given a distinct colour and name.
Background Pre-1999
Rail services in Great Britain are mostly run under franchises operated by private train operating companies, marketed together as National Rail.
The concept of developing a network of orbital services around London goes back to the independently produced Ringrail proposals in the early 1970s. Some of these were evaluated in the London Rail Study of 1974 (the Barren Report) and Barren suggested consideration of a North London Network of orbital services, based on a later suggestion by the Ringrail Group, which involved using many existing rail routes, rather than the new construction suggested in earlier drafts of the Ringrail Plan.
The proposal from Barren was for several overlapping services mainly using the North London line, generally at 20-minute intervals. The suggested routes followed the original North London line service from to , new services from to , and a third service from to . Nothing came of these proposals.
In 1979, the Greater London Council (GLC) decided to sponsor an improved service from , on the North London line, to North Woolwich, opening up a previously freight-only line between and and linking it to an improved Stratford – North Woolwich service. This was given the marketing name Crosstown Linkline, and operated with basic two-car diesel multiple units.
The next initiative came from the GLC in 1984, when the government supported the Broadgate development that would entail the demolition of Broad Street station. The closure process was convoluted because of problems in making alternative arrangements for the North London line, and the remaining services operating from to the City. These eventually ran to and from via a new section of track, the Graham Road Curve.
British Rail replaced the existing three-car electric trains (built 1957) with slightly newer but shorter two-car electric trains (built 1959), leading to overcrowding. In 1988, by reorganising and reducing services on the Great Northern routes from , about 18 relatively modern dual-voltage electric trains were transferred to operate the North London and Watford services, from both and Liverpool Street.
Several voluntary sector groups, the Railway Development Society (RDS, later Railfuture), Transport 2000's then London groups, and the Capital Transport Campaign, launched a series of leaflets and briefings promoting a concept called Outer Circle. This name had once been used for a semi-circular service from Broad Street to , which ceased during World War I.
History
Mayor of London and GLA
The pamphlets and briefings, first issued in 1997, initially suggested a route from Clapham Junction to the Greenwich Peninsula, intended to improve access from south London to the Millennium Dome. However, this was thwarted by architect Richard Rogers who considered that a railway route on a viaduct could cause "community severance", and so the Victorian brick viaduct was demolished. Nothing further happened to develop this network until after the new Greater London Authority (GLA) was launched in 2000. But the lobbying discreetly continued, with a series of short briefings published by one RDS member based in North London. Mayoral and GLA candidates were approached to discuss the viability of the Outer Circle concept. The principle was widely supported and was adopted into the first Mayor's Transport Plan, published in 2001.
Meanwhile, a pilot scheme was launched in 2003 to bring several National Rail local services, mainly in South London, operated by Connex South Eastern, Southern and South West Trains under the ON – Overground Network brand. TfL introduced consistent information displays, station signage and maps on the selected routes in South London. Although this pilot was primarily an exercise in branding, some service improvements were introduced, and it was the first instance of the newly created TfL having a visible influence over National Rail services. The pilot scheme was later dropped.
The Silverlink franchise on the North London line was frequently regarded by travellers as having offered a poor service, complaints centring around extremely congested trains and unreliable service. The quality of the Class 313 trains used were also criticised; its interiors were of noticeably lower quality compared to that of newer trains and the trains themselves were viewed as unwelcoming to passengers, particularly during late hours.
In January 2004 the Department for Transport (DfT) announced a review of the rail industry in Great Britain. As part of that review, TfL proposed a "London Regional Rail Authority" to give TfL regulatory powers over rail services in and around Greater London. A result of this consultation was agreement by the Secretary of State for Transport, Alistair Darling, to transfer the Silverlink Metro services from DfT to TfL control.
Silverlink had two areas of operation: Silverlink County regional services from to , , and ; and Silverlink Metro within the London urban area. When the franchise was split up in 2007, County services were taken over by the London Midland franchise, and the Metro services came under TfL control. TfL decided to let this franchise as a management contract, with TfL taking the revenue risk.
Announcements and launch On 20 February 2006, the DfT announced that TfL would take over management of services then provided by Silverlink Metro. Tenders were invited to operate the service under the provisional name of the North London Railway. Four bidders were shortlisted – Govia, MTR/Laing Rail, National Express and NedRail. In August 2006, a contract worth £223 million was signed with rolling stock manufacturer Bombardier for new trains, with an initial batch of 152 individual cars to be delivered from September 2008, as well as options to purchase additional cars.
On 5 September 2006, TfL announced that the extended East London line would be included, and the operation would be branded as London Overground. (via archive.org). In June 2007, TfL announced that London Overground Rail Operations (a joint venture of Laing Rail and MTR Corporation) had been awarded the contract, with TfL promising "more staff, new trains, a vastly upgraded service, and refurbished and new stations" when they took over in November 2007. On 25 June 2007, a statutory instrument was laid before parliament to exclude the ex-Silverlink metro lines from the franchising process, which enabled them to be operated as a concession.
On 11 November 2007, TfL took over suburban services previously operated by Silverlink Metro. The following day there was an official launch ceremony at with then Mayor of London, Ken Livingstone; there was also a later media event on the bay platform at . The launch was accompanied by a marketing campaign entitled "London's new train set", with posters and leaflets carrying an image of model railway packaging containing new Overground trains, tracks and staff. TfL undertook to revamp the routes by improving service frequencies and station facilities, staffing all stations, introducing new rolling stock and allowing Oyster pay as you go throughout the network from the outset.
After the takeover, all stations were "deep-cleaned", and Silverlink branding removed. Station signage was replaced with Overground-branded signs using TfL's corporate New Johnston typeface. In July 2009, the first of the new Class 378 trains entered service.
On 15 April 2009, the North London line trains at Stratford moved to new high-level platforms 1 and 2 from low-level platforms 1 and 2, which were needed to allow the construction of an extension of the Docklands Light Railway to . The new platforms 1 and 2 are an island platform with step-free access to platform 12 and subway links to platforms 3–11.London Overground: Stratford Platform Changes (Information leaflet, TfL January 2009) On 27 September 2009, opened on the West London line, between and .
East London line extension
On 27 April 2010, the East London line became part of the London Overground network when the Phase 1 extension was completed. The former London Underground line was extended northwards, mostly along the former Kingsland Viaduct from on the North London line, to the re-opened , and southwards to and .
Services began with a limited preview service between Dalston Junction and New Cross/New Cross Gate, with full service between Dalston Junction and West Croydon/Crystal Palace on 23 May. On 28 February 2011, the line between Dalston Junction and Highbury & Islington was opened. In attendance were the Mayor of London and London Underground's Managing Director. TfL announced in November 2010 that ridership was ahead of forecast at 92,000 a day, and that patronage at had "gone through the roof".
The incorporation of the East London line into the Overground network has put substantial sections of line in tunnel, including the historic Thames Tunnel, the first and oldest tunnel underneath any navigable river in the world. A peculiarity is that, at Whitechapel, the London Overground passes underneath the London Underground (although there are many other places on the network where this occurs, e.g. the Watford Junction to Euston route between and – shared with the Bakerloo line – passes underneath the Metropolitan line between and Preston Road).
South London line extension
The next addition opened on 9 December 2012, from to via the South London line, calling at , , , and . The extension uses an alignment between Surrey Quays and just north of that had been disused since 1911; new track was laid after some major civil engineering works. Passive provision has also been made for a new station at , to be constructed when funding becomes fully available. This was put on hold in 2009, although a suitable station 'foundation structure' has been built to facilitate completion in the future.
Funding for the railway rebuilding project was secured in February 2009, including £64 million from the DfT and £15 million from TfL, and construction began in May 2011.
The route passes over both and stations without stopping, and this lack of interchange stations was criticised by local politicians during the planning phase of the project. No stations are planned at these locations as the line is on high railway arches, making the cost of any station construction prohibitive.
Liverpool Street station services On 31 May 2015, the to , (via ) and services, (formerly known as the Lea Valley Lines, and currently known as the Weaver line) as well as the to service, (now the Liberty line) were transferred from Greater Anglia to TfL to become part of the London Overground network.London Overground operator appointed to run additional services for TfL Travel & Tour World 4 June 2013
Network Introduction