Baker Street tube station is a station on the London Underground located on Baker Street. The station lies in Travelcard Zone 1 and is served by five different lines. On the Circle and Hammersmith & City Lines it is between Great Portland Street and Edgware Road. On the Metropolitan Line it is between Great Portland Street and Finchley Road. On the Bakerloo Line it is between Regent's Park and Marylebone and on the Jubilee Line it is between Bond Street and St. John's Wood. Baker Street station was opened by the Metropolitan Railway (MR) on 10 January 1863 as one of the original stations on the world's first underground railway - these platforms are now served by the Circle and Hammersmith & City lines. On 13 April 1868 the adjacent open platforms, now serving the Metropolitan line, opened as part of a spur to Swiss Cottage station (a closed station different to the current Jubilee Line Swiss Cottage station) which was to be steadily extended to Harrow-on-the-Hill and beyond. Over the next few decades this section of the station saw much rebuilding to provide 4 platforms. The current Metropolitan line layout largely dates from 1925 and the bulk of the surface buildings, designed by the architect Charles Clark, also date from this period. The Baker Street & Waterloo Railway (BS&WR, now the Bakerloo Line) opened on 10 March 1906, with Baker Street as the initial northern terminus of the line before it was extended to Marylebone station on 27 March 1907. On 20 November 1939, the Bakerloo Line took over the the Stanmore branch of the Metropolitan Line (including stopping services between Finchley Road and Wembley Park) following the construction of two additional platforms and connecting tube tunnels between Baker Street and Finchley Road. The Jubilee Line subsequently replaced the Bakerloo Line on the Stanmore branch from its opening on 1 May 1979. For more information on the London Underground roundel, see this picture.