Line Colour Number
of Stations		 Length of
track (km)
Bakerloo Brown 25 23.2
Central Red 49 74
Circle Yellow 27 22.5
District Green 60 64
East London Orange 9 8
Hammersmith and City Pink 28 26.5
Jubilee Grey 27 36.2
Metropolitan Burgandy 34 66.7
Northern Black 51 58
Piccadilly Royal Blue 52 71
Victoria Light Blue 16 21
Waterloo and City Teal 2 2.4

The London Underground opened on the 10th January 1863 with the line from Bishop's Road, Paddington to Farringdon Street, a length of 3.75 miles. It is still the world's longest Underground system with some 251 miles of track length, although more than half of the track length is actually normal surface rail.

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London Underground - Facts
   
Highest Point Amersham on the metropolitan line is the highest point on the London underground. It is 500 feet above sea level.
Highest Point Above the Ground Dollis Brook Viaduct on the Mill Hill East branch of the Northern Line
Lowest Point South of Waterloo Station on the northern Line where the tracks are 70 feet below sea level.
Deepest Below Ground Hampstead Heath on the Northern Line. 220 ft below ground level.
Longest Continuous Journey on the Underground Central Line West Ruislip to Epping. 34 miles.
Longest Possible Journey Northern Line - Morden to East Finchley via City branch. 17 miles.
Furthest Destinations North - Epping on the Central Line, South - Morden on the Northern Line, West - Amersham on Metropolitan Line, East - Upminster on the District Line
Longest Distance Between Adjacent Stations Chesham to Chalfont and Latimer on the Metropolitan Line. 4 miles
Shortest Distance Between Adjacent Stations Picadilly line Covent Garden to Leicester square. 256 metres
Shortest Line Waterloo and City Line
Busiest Line District Line 180 Million passengers per year.
Busiest Station Victoria, around 85 million passengers per year.
Shortest Esculator Chancery Lane Station
Longest Esculator Angel Station on the City branch of the Northern Line
Biggest Station Baker Street and Moorgate. Both have ten platforms
Smaller Station Heathrow terminal 4, Chesham, and Mill Hill East. All have just one platform