Hopes of averting tonight's Tube strike appeared to dwindle today as union leaders issued a series of hardline demands at the start of peace talks.
Senior officials from the RMT called on London Underground to withdraw its controversial plan to close ticket offices and axe 950 jobs.
RMT members are due to start a 48-hour strike at 9pm.
LU has warned commuters to expect significant disruption.
The two sides met for last-ditch talks at the offices of the conciliation service ACAS on the 22nd floor of Euston Tower.
RMT negotiator John Leach said the strike could be suspended if LU made concessions including a station by station review.
"They need to move their position from closing every single London Underground ticket office and also getting rid of 950 jobs from the frontline station grades.
"They need to sit down and listen to us. They need to do this review properly and then we might be in a position to suspend.
"But let's remember they have spent nine weeks not doing that."
London Underground managing director Mike Brown declined to say whether he was optimistic.
"We'll do whatever we can to keep talking during the day to try and resolve this absolutely unnecessary strike," he added.
"I'm gonna go in and have a conversation. Let's see where we get to."