A planned 24-hour strike on London Underground's Piccadilly Line on Wednesday has been called off.
Planned Piccadilly Line strike called off
But Tube passengers will still suffer disruption because of a walkout on the Central Line.
Members of the Rail, Maritime and Transport (RMT) union on the Piccadilly Line, which links central London to Heathrow Airport, were due to strike from noon on Wednesday.
The union said it was suspending the action after progress was made in talks in a dispute over industrial relations.
RMT general secretary Mick Cash said: "I want to pay tribute to RMT members on the Piccadilly Line whose solidarity and resilience has been the decisive factor in forcing LondonUnderground back to the negotiating table where sufficient progress has been made to allow the scheduled action tomorrow to be suspended.
"The union remains vigilant to any attacks and abuse of policies, procedures and agreements on London Underground and will always take the required action to protect dignity, fairness and justice in the workplace.
"Industrial relations along the Central Line have been at breaking point for some time now and the failure of the management to address the issues, and a conscious decision to up the ante by attempting to single out and pick off individual members of staff, has tipped the situation over the edge and has led to the announcement of strike action.
"The union is angry and frustrated that the management side have squandered a golden opportunity to resolve the issues at the heart of the dispute through the talks process. As a result of that management side failure, the action goes ahead as planned
"There is a growing culture on London Underground that revolves around refusing to employ enough drivers, bullying staff and expecting our members to pick up the pieces when the service breaks down."
Members of the drivers' union Aslef will also be on strike on Wednesday on the Central Line - the second busiest on the network.