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Passengers on the tube had to be led along tracks through an underground tunnel for the second day in a row, because of more disruption to services.
Around 400 passengers on the Victoria line were stuck in a tunnel near Seven Sisters after a faulty train caused huge delays in this morning's rush hour.
There were also delays on other lines because of signal failures, track problems and a ban on overtime by workers.
Transport for London has apologised for the disruption.