London Underground ticketing London Underground ticketing The London Underground metro system of London, England uses a mix of paper and electronic smart-card ticketing. London Underground uses Transport for London's Travelcard zones to calculate fares, including fares on the Underground only. Travelcard Zone 1 is the most central, with a boundary just outside the Circle line and Travelcard Zone 6 is the most outlying zone covering any of Greater London and it includes London Heathrow Airport. All of Greater London is covered by zones 1 to 6. Tickets including zone 1 are usually more expensive than those involving only outer zones. The most popular
History of the London Underground changed from serving a closed loop around the centre of London on the north side of the River Thames to a spiral serving Hammersmith. On the Jubilee line a seventh car was added to all trains, in 2006 and a new signalling system allowing automatic operation was commissioned in 2011. On the Victoria line, new trains were introduced between July 2009 and June 2011, and a new signalling system has allowed 33 trains per hour from January 2013. The sub-surface (Metropolitan, District, Circle and Hammersmith & City) lines have been upgraded, with new air-conditioned S Stock. Also, the sub-surface track,