A three-day strike by London Underground (LU) workers which had been due to start on Monday evening has been suspended, the RMT union has said.
The dispute was over LU's plan to close all ticket offices and cut 960 jobs.
The RMT's acting general secretary Mick Cash said they had secured "real movement and significant progress".
London Mayor Boris Johnson said the suspension of the strike was a "victory for common sense and for Londoners".
LU and the RMT met hours before the walkout was due to start at 21:00 BST.
A 48-hour strike last week caused considerable transport disruption.
Mr Cash said that due to the "solidarity and determination of our LU members" they had been able to make progress on "the issues at the heart of this dispute in talks with the Tube management over the bank holiday weekend".
He added: "Pre-conditions have been removed, protection of earnings has been agreed and we now have a viable framework for a proper review of the cuts and closures programme."
'Tactics aren't working'
LU Chief Operating Officer Phil Hufton said he was "pleased that Londoners will not have to endure further strike action this week".
Mr Hufton added: "Modernisation of the Tube means that it is our intention to close all ticket offices, used in less than 3% of journeys, and instead deliver a vastly better customer service by bringing more staff than ever before out on to the concourses of stations at ticket machines, ticket gates and platforms - just as we delivered during the London 2012 Games.
"This will also allow us to save £50m per annum to reinvest in better and more reliable train services and to keep fares down."
London mayor Mr Johnson said the RMT leadership had "finally seen that their tactics aren't working".
He added: "I always said these strikes were pointless, and by getting so many people to work during last week's stoppage Transport for London has shown the RMT that its actions, supported by a minority of its members, will achieve nothing."
During last week's 48-hour Tube strike, which began at 21:00 BST on Monday, Transport for London said 50% of services were running on Tuesday, while 52% of services ran on Wednesday.
LU said it managed to operate some level of service on all 11 lines on Wednesday, while extra bus services were in operation.
According to LU, the form of words agreed at conciliation service Acas, which led to the suspension of the strike, are as follows:
- The station-by-station review will continue with all the trade unions invited to participate and contribute, additionally the proposed FftF-S implementation plan will also be reviewed. This exercise should be completed by 23 May. During this period of discussion LU would continue to keep on hold all VS [voluntary severance] applications.
- The outcome of the exercise will be discussed at a meeting chaired by Acas
- LU would enter into further detailed discussions to ensure that any employees identified as in scope of the Fit for the Future - Stations proposals on 21 November 2013, and who do not choose to leave the business under voluntary severance, would be offered a role that involves no reduction in their current substantive salary. This arrangement would be specific to the Fit for the Future - Stations programme.