The Metropolitan line should be the fastest. They are capable of the highest speeds. The second fastest is Central, third fastest is Jubilee, and other fast lines are Victoria and Piccadilly. Circle line is the slowest of all.
The Central Line
The Northern Line.
The Circle Line.
District Line (London Underground) from Hammersmith tube station to Victoria tube station.
Camden
Camden
The Central line is the current oldest tube stock in the whole of the London Underground.
The Circle Line Unfortunately this answer is wrong! According to Transport for London the only tube line to connect all London Underground lines is the Jubilee Line.
The Tube lines in London, in order, are: Bakerloo Line, Central Line, Circle Line, District Line, Hammersmith & City Line, Jubilee Line, Metropolitan Line, Northern Line, Piccadilly Line, Victoria Line, and Waterloo & City Line. Each line is color-coded on the Tube map and serves various areas of London, connecting key stations and landmarks.
Depends on the context: London has a tube (Metro) line which is called the Circle Line.
Redbridge on the Central Line - which is also coloured red on the tube map.
The oldest tube line in London is the Metropolitan Line, which opened on January 10, 1863. It was the first underground railway in the world and initially ran between Paddington and Farringdon. The line was designed to alleviate congestion on the streets of London and has since expanded significantly.