The longest possible single journey on one train is 34 miles, between West Ruislip and Epping on the Central Line. During the Second World War, part of the Piccadilly line was used to store British Museum treasures.
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The Central Line was opened in 1900 and is forty six miles long, making it the longest line of the system, between the stations of West Ruislip and Epping. The Central Line is one of only two lines which have stations outside the boundaries of Greater London.
Book travel across EuropeThe HS1 line is used by Eurostar services and Javelin commuter services from Kent, although the latter have a max speed of 140mph. Across the rest of the UK, trains have a maximum operational speed of 125mph, although many are capable of speeds of up to 140mph.
It is easier and safer to dig at depth in London because of the nature of the soil and to avoid other infrastructure and the Thames. It also may result from the fact that London is quite hilly and trains don't like going up hills, so the tube goes through the hill.
The average speed on the Underground is 20.5 mph (33.0 km/h). Outside the tunnels of central London, many lines' trains tend to travel at over 40 mph (64 km/h) in the suburban and countryside areas. The Metropolitan line can reach speeds of 62 mph (100 km/h).
The Waterloo & City and the Jubilee were the coolest lines, while the Metropolitan and Hammersmith & City attracted fewest complaints. TfL said air-conditioned trains were in use on 40 per cent of the Underground network. New trains due to be introduced on the Piccadilly line from 2025 will also have air conditioning.
The deepest station is Hampstead on the Northern line, which runs down to 58.5 metres. 15. In Central London the deepest station below street level is also the Northern line.