The Metropolitan line is part of the London Underground. It is coloured in TfL's Corporate Magenta on the Tube map and in other branding. It was the first underground railway in the world, opening on 10 January 1863. The main line runs from Aldgate in the City of London to Amersham, with branch lines to Uxbridge, Watford and Chesham. For the initial section of the line the rails are in tunnel for much of the way; beyond Baker Street, at Finchley Road the line runs in the open. Out of the 34 stations served, only 9 are underground. It is the oldest line and initially covered the bulk of the Underground system. Today it is the ninth busiest line on the network.

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