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London Overground is a suburban rail network in London, England. It was created in 2007 by the merger of the former Silverlink Metro service with other rail services. The network consists of 112 stations and serves 23 London boroughs. London Overground operates on these routes, which include Highbury & Islington to West Croydon/Clapham Junction/Crystal Palace, Richmond/Clapham Junction to Stratford, Gospel Oak to Barking Riverside, Watford Junction to Euston, Liverpool Street to Enfield Town/Cheshunt, Liverpool Street to Chingford, and Romford to Upminster. Overground is operated by Arriva Rail London under a concession from Transport for London.

Thameslink is a railway service in the United Kingdom that runs through central London, connecting Bedford in the north and Brighton in the south. It is operated by Govia Thameslink Railway and serves over 200 stations, including major transport hubs such as St Pancras International, London Bridge, and Gatwick Airport. Thameslink trains run every few minutes during peak hours and offer a range of services, from fast express trains to stopping services that serve local communities. The service has undergone significant upgrades in recent years, including the introduction of new trains and the completion of major infrastructure projects such as the Thameslink Programme.