Question: Bethnal Green is a station in what rail network established in 2007?

full_context: Document 1: List of metro systems: This list of metro systems includes electrified rapid transit train systems worldwide. In some cases, metro systems are referred to as "subways", "U-Bahns" or "undergrounds". s of October 2014 , 157 cities in 55 countries around the world host the approximately 160 metro systems that are listed here. The London Underground first opened as an "underground railway" in 1863 and its first electrified underground line opened in 1890, making it the world's first metro system. The metro system with the longest route length is the Shanghai Metro; the busiest one is the Beijing Subway; and the one with the most stations is the New York City Subway.
Document 2: Green Spring Academy Shoreditch: Green Spring Academy Shoreditch (formerly known as Daniel Street School, Daneford, Bethnal Green High School, Bethnal Green Technology College and Bethnal Green Academy) is a co-educational academy for students aged between 11-19 based in Bethnal Green in the London Borough of Tower Hamlets, in East London.
Document 3: Highbury &amp; Islington station: Highbury & Islington is a London Underground and National Rail interchange station in the London Borough of Islington, north London. It is served by the London Underground's Victoria line, London Overground's East and North London Lines, and Great Northern's Northern City Line.
Document 4: Bethnal Green tube station: Bethnal Green is a London Underground station in Bethnal Green, east London. The station is situated in the East End of London and is served by the Central line lying between Liverpool Street and Mile End stations. The station was opened as part of the long planned Central line eastern extension on 4 December 1946; before that it was used as an air-raid shelter. On 3 March 1943, 173 people were killed in a crush while attempting to enter the shelter.
Document 5: London Overground: The London Overground (also known as the Overground) is a suburban rail network in the United Kingdom. Established in 2007, it serves a large part of Greater London and parts of Hertfordshire, with 112 stations on several routes. The network forms part of the National Rail network, but under the franchise control and branding of Transport for London (TfL). Operation has been contracted to Arriva Rail London since 13 November 2016.
Document 6: London Underground: The London Underground (also known simply as the Underground, or by its nickname the Tube) is a public rapid transit system serving London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.
Document 7: Whitechapel station: Whitechapel is a London Underground and London Overground station in the district of Whitechapel in east London. It lies between Aldgate East and Stepney Green stations on the District and Hammersmith & City lines, and between Shoreditch High Street and Shadwell stations on the East London Line. It is in Travelcard Zone 2.
Document 8: Bethnal Green railway station: Bethnal Green is a London Overground station in the district of Bethnal Green, East London, on the Lea Valley Lines network 1 mi down-line from London Liverpool Street; the next station down-line is either (for services to and from ) or (for services to and from and ). Its three-letter station code is BET and it is in Travelcard zone 2.
Document 9: History of public transport authorities in London: The history of public transport authorities in London details the various organisations that have been responsible for the public transport network in and around London, England from 1933 until 2000 and have used the London Transport brand. Their responsibilities have encompassed the buses, coaches, trams and the London Underground. The period began with the creation of the London Passenger Transport Board, which covered the County of London and adjacent counties within a 30-mile (48-km) radius. This area later came under the control of the London Transport Executive and then the London Transport Board. The area of responsibility was reduced to that of the Greater London administrative area in 1970 when the Greater London Council, and then London Regional Transport took over responsibility. Since 2000, the Greater London Authority has been the transport authority and the executive agency has been called Transport for London; ending the 67-year use of the "London Transport" name.
Document 10: Network SouthCentral: Network SouthCentral (NSC) was a shadow franchise that existed from 4 February 1994 to 13 October 1996, when Connex South Central took over the running of the franchise. The franchise is now part of the Thameslink, Southern and Great Northern franchise operated by Govia Thameslink Railway under the Southern brand. As with all shadow franchises, Network SouthCentral was a wholly owned subsidiary of the British Railways Board.
Document 11: St Barnabas's, Bethnal Green: St Barnabas Bethnal Green is a late 19th-century church on the boundaries of Bethnal Green and Bow, near Old Ford, London, England. It is an Anglican church in the Diocese of London. The church is at the junction of Roman Road and Grove Road in the Bow West ward of London Borough of Tower Hamlets.
Document 12: Herne Hill railway station: Herne Hill railway station is in the London Borough of Lambeth, South London, England, on the boundary between London fare zones 2 and 3. Train services are provided by Thameslink to London Blackfriars, Farringdon, St Pancras International and Luton Airport on the Thameslink route and by Southeastern to London Victoria (via Brixton) and Orpington on the Chatham Main Line.
Document 13: Southern (Govia Thameslink Railway): Southern is the brand name used by the Govia Thameslink Railway (GTR) train operating company on the Southern routes of the Thameslink, Southern and Great Northern franchise in England. It is a subsidiary of Govia, a joint venture between transport groups Go-Ahead and Keolis, and has operated the South Central rail franchise since August 2001 and the Gatwick Express service since June 2008. In July 2015, the franchisee was subsumed into GTR, but the Southern and Gatwick Express brand identities were retained alongside those of Thameslink and Great Northern.
Document 14: Northern City Line: The Northern City Line is a branch railway and commuter line in England, which runs from Moorgate to Finsbury Park in London with services running beyond. It is part of the Great Northern Route services and operates as the south-eastern branch of the East Coast Main Line (ECML). It is underground from Moorgate to Drayton Park in Highbury from which point it runs in a cutting until joining the ECML south of Finsbury Park. Its stations span northern inner districts of Greater London southwards to the City of London, the UK's main financial centre. Since December 2015 the service timetable has been extended to run into the late evenings and at weekends, meeting a new franchise commitment for a minimum of 6 trains per hour until 23:59 on weekdays and 4 trains per hour at weekends.
Document 15: Bethnal Green (UK Parliament constituency): Bethnal Green was a parliamentary constituency in the Bethnal Green area of the East End of London, which returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1950 until it was abolished for the February 1974 general election.
ground_truth: London Overground