<Table> London Underground <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> A deep - level Central line train at Lancaster Gate bound for Ealing Broadway </Td> </Tr> <Tr> <Td_colspan="2"> A larger sub-surface Metropolitan line train at Farringdon bound for Aldgate </Td> </Tr> <Tr> <Th_colspan="2"> Overview </Th> </Tr> <Tr> <Th> Locale </Th> <Td> Greater London, Buckinghamshire, Essex, Hertfordshire </Td> </Tr> <Tr> <Th> Transit type </Th> <Td> Rapid transit </Td> </Tr> <Tr> <Th> Number of lines </Th> <Td> 11 </Td> </Tr> <Tr> <Th> Number of stations </Th> <Td> 270 served (260 owned) </Td> </Tr> <Tr> <Th> Daily ridership </Th> <Td> 5 million </Td> </Tr> <Tr> <Th> Annual ridership </Th> <Td> 1.379 billion (2016 / 17) </Td> </Tr> <Tr> <Th> Website </Th> <Td> London Underground </Td> </Tr> <Tr> <Th_colspan="2"> Operation </Th> </Tr> <Tr> <Th> Began operation </Th> <Td> 10 January 1863; 154 years ago (1863 - 01 - 10) </Td> </Tr> <Tr> <Th> Operator (s) </Th> <Td> London Underground Limited </Td> </Tr> <Tr> <Th> Reporting marks </Th> <Td> LT (National Rail) </Td> </Tr> <Tr> <Th_colspan="2"> Technical </Th> </Tr> <Tr> <Th> System length </Th> <Td> 402 km (250 mi) </Td> </Tr> <Tr> <Th> Track gauge </Th> <Td> 1,435 mm (4 ft 8 ⁄ in) standard gauge </Td> </Tr> <Tr> <Th> Electrification </Th> <Td> 630 V DC fourth rail </Td> </Tr> <Tr> <Th> Average speed </Th> <Td> 33 km / h (21 mph) </Td> </Tr> </Table> <Tr> <Td_colspan="2"> A deep - level Central line train at Lancaster Gate bound for Ealing Broadway </Td> </Tr>

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