Question: Which rail network that was established in 2007 and serves a large part of Greater London also manages and serves Kensington?
Context: The acceptance of Oyster card pay as you go (PAYG) on National Rail in London, England, was limited to a restricted number of National Rail services at the introduction of the stored-value product on London Underground in January 2004.  In response to an offer from Transport for London of funding to the train operating companies that have services within Greater London, plans were made to expand its acceptance across the rail network in London, and it was expected that by February 2009 TFL would announce plans for all suburban trains to accept the card.  In May 2009 London TravelWatch indicated it had discovered that the works were unlikely to be completed until 2010. The Downtown Seattle Transit Tunnel (DSTT), also referred to as the Metro Bus Tunnel, is a 1.3 mi pair of public transit tunnels in Seattle, Washington, United States.  The tunnel serves Downtown Seattle, running west under Pine Street from 9th Avenue to 3rd Avenue, and south under 3rd Avenue to South Jackson Street.  It was used only by buses from its opening in 1990 until 2005, and since 2009 it has been shared by buses and light rail.  The double-track tunnel and its stations, except Convention Place, constitute parts of the Central Link light rail line, which continues north to the University of Washington station and south through the Rainier Valley to Seattle–Tacoma International Airport as part of Sound Transit's Link light rail network.  Its five stations are also served by King County Metro and Sound Transit Express buses that leave the tunnel north via Interstate 5, south via the SODO Busway, or east via Interstate 90.  The DSTT is the busiest section of the Link light rail network, with an average of over 10,000 weekday boardings.  It is owned by King County Metro and shared with Sound Transit through a joint-operating agreement signed in 2002.  The Downtown Seattle Transit Tunnel is one of two tunnels in the United States shared by buses and trains, the other being the Mount Washington Transit Tunnel in Pittsburgh, and is the only one in the United States with shared stations. High-speed rail is emerging in Europe as an increasingly popular and efficient means of transport.  The first high-speed rail lines in Europe, built in the 1980s and 1990s, improved travel times on intra-national corridors.  Since then, several countries have built extensive high-speed networks, and there are now several cross-border high-speed rail links.  Railway operators frequently run international services, and tracks are continuously being built and upgraded to international standards on the emerging European high-speed rail network.  In 2007, a consortium of European railway operators, Railteam, emerged to co-ordinate and boost cross-border high-speed rail travel.  Developing a Trans-European high-speed rail network is a stated goal of the European Union, and most cross-border railway lines receive EU funding.  Several countries — France, Spain, Italy, Germany, Austria, Sweden, Belgium, the Netherlands, Russia and the United Kingdom — are connected to a cross-border high-speed railway network.  More are expected to be connected in the coming years as Europe invests heavily in tunnels, bridges and other infrastructure and development projects across the continent, many of which are under construction now.  Alstom was the first manufacturer to design and deliver a high speed train or HS-Train, which ended up in service with TGV in France.  Currently, there are a number of high-level manufacturers designing and building HSR in Europe, with criss-crossed alliances and partnerships, including Canadian company Bombardier, Alstom itself, the Spanish Talgo and the German Siemens. 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. Rail service fares in Greater London and the surrounding area are calculated in accordance with the London fare zones system managed by Transport for London.  Within London, all London Underground, National Rail, London Overground, TfL Rail and Docklands Light Railway stations are assigned to nine fare zones.  Fare zone 1 covers the central area and fare zones 2, 3, 4, 5 and 6 form concentric rings around it.  Some National Rail stations and all Transport for London served stations outside Greater London in the counties of Buckinghamshire, Essex, Hertfordshire and Surrey are either included in fare zones 4,5 or 6 or in extended zones beyond these.  Transport for London fare zones are also known simply as zones or travelcard zones, referring to their use in calculating prices for the travelcard product.  Before flat fares were introduced in 2004, fare zones were used on the London Buses network.  London fare zones are also used for calculating the cost of single and return paper tickets, Oyster card pay-as-you-go fares and season tickets. Rail transport in Israel includes heavy rail (inter-city, commuter, and freight rail) as well as light rail.  Excluding light rail, the network consists of 1001 km of track, and is undergoing constant expansion.  All of the lines are standard gauge and as of 2016 the heavy rail network is in the initial stages of an electrification programme.  A government owned company, Israel Railways, manages the entire heavy rail network.  Most of the network is located on the densely populated coastal plain.  The only light rail line in Israel is the Jerusalem Light Rail, though another line in Tel Aviv is currently under construction. Barking is an interchange railway station located on Station Parade in the Barking district in Greater London, England.  The station is served by London Underground and National Rail services.  On the London Underground it is a stop on the District line and the eastern terminus of the Hammersmith & City line; on the National Rail network it is served by c2c services; and on the London Overground it is the eastern terminus of the Gospel Oak to Barking Line.  The station was opened in 1854 by the London, Tilbury and Southend Railway as one of the first stations on the route.  It was rebuilt in 1908 and again in 1959.  , significant redevelopment of the station is currently proposed by Barking and Dagenham London Borough Council and the Department for Transport. London Rail is a directorate of Transport for London (TfL), involved in the relationship with the National Rail network within Greater London, UK.  It manages non-tube rail systems in Greater London. Kensington (Olympia) is a combined rail and tube station between Kensington and West Kensington on the boundary of west and central London.  It is managed and served by London Overground and also served by Southern and London Underground.  It is in Travelcard Zone 2.  On the Underground it is the terminus of a short District line branch, built as part of the Middle Circle, from Earl's Court ; on the main-line railway it is on the West London Line from Clapham Junction to Willesden Junction , by which many trains bypass Central London.  The station's name is drawn from its location in Kensington and the adjacent Olympia exhibition centre. Croydon, located in Greater London, England, has a diverse economy with the service and retail sectors now dominating over the town's historical market status.  It is today served well by its extensive rail network centering on East and West Croydon stations, from where London Overground, First Capital Connect and Southern operate to most parts of Greater London, Surrey, Sussex, Hampshire and the East of England.  With the A23, M23 and M25 orbital motorway intersecting Croydon to the South East, it is the principal gateway of the motorway network from the East Sussex area of the South Coast.  London Gatwick Airport is located to the direct south of the town and has scheduled flights to destinations within Europe, North America and Asia, although has tough competition from the even bigger London Heathrow Airport to the west but has managed to stay the UK's second busiest airport.  The town has since 2000 had a tram network which has been highly successful, carrying more than 24 million passengers a year.  The network has four lines with destinations including New Addington to Wimbledon, Beckenham to West Croydon, Elmers End to Therapia Lane, and Elmers End to West Croydon.  Croydon is one of only five London boroughs not to have any form of London Underground services.
Answer: London Overground