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9 September 2010, 14:34 | Updated: 9 September 2010, 14:36
An investigation's started into an incident on the tube where a train was switched onto the wrong track.
Transport for London say a signalling "irregularity" was to blame for a westbound train on the Hammersmith and City line being routed on to eastbound tracks.
It happened during the rush hour yesterday morning, a day after tube trains were disrupted because of a strike by thousands of workers in a row over jobs.