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The fault is the first of its kind for more than two years, according to TfL. The Oyster system on London's public transport network has suffered a fault, rendering the electronic cards inoperable for about four hours. The cards are used as a form of payment across the city on the Tube, buses, trams and the Docklands Light Railway. But a fault lasting from about 0530 BST to 0930 BST on Saturday meant card readers did not work and ticket barriers had to be left open. Transport for London apologised and said Oyster faults were "very rare". It said a problem of this nature had not occurred since March 2006. Passengers touch the electronic card on the reader on entry or exit to a station, or when entering a bus. A spokeswoman said: "Due to a technical problem with the Oystercard computer system, card readers across the network... [read full story]

