Farringdon is a London Underground and connected main line National Rail station in Clerkenwell, London, England, in the London Borough of Islington, just outside the boundary of the City of London. Opened in 1863 as the terminus of the Metropolitan Railway, the world's first underground passenger railway, Farringdon is one of the oldest surviving underground railway stations in the world.
Today the station is served by the London Underground Circle, Hammersmith & City, and Metropolitan lines between King's Cross St. Pancras Station and Barbican Station the Thameslink Route between St Pancras and City Thameslink, and the TfL Elizabeth line.
More information on the Wikipedia page [1] and the TfL page [2].