London Underground bosses tonight warned millions of commuters to expect three days of disruption as another tube strike looked increasingly likely.
Members of the RMT and TSSA are due to stop work at 9pm tomorrow in a dispute over ticket office closures.
Senior executives and union officials will meet again at the conciliation service ACAS tomorrow in a last-ditch attempt to settle the dispute.
The two sides returned to ACAS on Friday following last week’s 48-hour walkout but after two days of talks no agreement has been reached.
When negotiations resume at 9am, management and unions will have less than 12 hours to cut a deal.
LU has published an emergency timetable which outlines the services it hopes to run if the strike goes ahead.
During last week’s walkout, London Underground ran fewer than half its normal number of trains.