'Entrance to the Clerkenwell Tunnel from Farringdon Street', c1876. Work on the world?s first underground railway began in 1860, under chief engineer John Fowler, a three mile tunnel ran from Paddington to Farringdon Street, Clerkenwell tunnel was first used by a GNR freight train on 27 January 1868. From "Old and New London: A Narrative of Its History, Its People, and Its Places. The Western and Northern Studies", by Edward Walford. [Cassell, Petter, Galpin & Co., London, Paris & New York]