London Underground Tube Map
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The Northern line is a deep-level tube line on the London Underground, coloured black on the Tube map. It carries more passengers per year than any other Underground line; 206,734,000 passengers
per annum. Despite its name, the Northern line does not serve the northernmost stations on the Underground network although, ironically, it does serve the southernmost station and serves 16 of the
Underground system's 29 stations south of the River Thames: a proportion higher than any other line. Of the 50 stations on the Northern line, 36 are underground.
The line has a complicated history and the current complex arrangement of two northern branches, two central branches and the southern branch reflects its genesis as three separate railway companies
that were brought together and combined in the 1920s and 1930s. An extension in the 1920s used a route originally planned by a fourth company and abandoned plans to extend the line southwards in the
1920s and northwards in the 1930s would have incorporated parts of the routes of a two further companies. From the 1930s to the 1970s, the tracks of a seventh company were also managed as a branch of
the Northern Line. Each platform is 110 metres long.
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