The power went at about 9.45pm, leaving trains in tunnels and at stations. London Underground was preparing an emergency regeneration of the system, in an attempt to get all trains to their stations. Clare Blackburn, of London Transport, said the problem was due to a power failure at the Lots Road power station in Chelsea, west London.
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Thousands of passengers were stranded on Tube trains in the capital last night after a system-wide power cut.