Fame Irene Cara
20 April 2011, 14:29
Boris Johnson's told London's Heart that the ongoing problems on the Jubilee Line are a disaster.
The Mayor says a 'superhuman' effort is underway to sort it out, and that it will mean they can run more trains on the line.
It comes after thousands of passangers were stuck for more than an hour last night because of a power-failure.
Transport for London have apologised and say they'll refund passengers affected.