The first underground railway in the world was the Metropolitan railway, which began to run between Paddington and Farringdon Street and then on to Moorgate in 1863. When it was extended into the Circle Line, around London's core, it ran into financial difficulties. The deep‐tunnelling methods of the 1890s greatly extended the system and enabled men and women to travel quickly from the suburbs to their place of work. The Central Line connecting the West End and the City was opened in 1900, and the rest of central London's underground system—except for the later Victoria and Jubilee lines—was finished before the First World War. See T. C. Barker and Michael Robbins, A History of London Transport, i: The Nineteenth Century (1963).