Northern line

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The Northern line is a London Underground line. It is coloured black on the Tube map. For most of its length it is built as a deep-level tube line.[2] The line carries 206,734,000 passengers per year.[1] This is the highest number of any line on the London Underground system but, exceptionally, the Northern line does have two branches through the centre of London. Despite its name, it does not serve the northernmost stations on the Underground network, although it does serve the southernmost station (Morden) as well as sixteen of the Underground system's 29 stations south of the River Thames. There are 50 stations on the Northern line, of which 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. Abandoned plans dating from the 1920s, to extend the line further southwards, and then northwards in the 1930s, would have incorporated parts of the routes of 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.[3]

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