Last minute talks are to be held later today in a bid to avert a planned tube strike from tonight.
The planned walkout by RMT union workers will begin at 9pm on Monday evening and last until Wednesday, April 30, at 8.59pm.
A second strike is planned for next Monday (May 5), but would last three days.
The District Line will run from Wimbledon to Barking every 12 minutes, calling at all stations.
Mick Cash, the RMT's acting general secretary, said the union was waiting for LU to provide it with a station-by-station review of the cuts and their impact on staff, passengers and safety.
Union workers say the proposed closure of tube station ticket offices will worsen safety and result in nearly a thousand job losses.
Phil Hufton, London Underground’s Chief operating Officer, said: “Our plans will radically improve the service we offer Tube customers in future.
"The whole Tube station will effectively become a personalised customer service centre, with more staff visible and available to help customers buy the right ticket, plan their journeys and get assistance.
“Over the past eight weeks, we have met with trades unions on more than 40 separate occasions.
"We have listened to their concerns and made changes as a result. We’ve provided guarantees that not a single member of staff will be forced to leave LU, that no supervisors must ‘apply for their own job’ and we are seeking ways to ensure that no member of staff sees their pay cut as a result of these changes.
“Given these commitments and guarantees, Londoners will rightly be asking why the RMT is threatening five days of strikes.
"All it will achieve is disruption to Londoners and a loss of pay for all those staff who take part. My message to the RMT leadership is its not too late to call off this unnecessary strike and continue to work with us to help shape the future of the Tube."