Planned strikes on the Piccadilly line have been suspended to allow further talks between union leaders and London Underground (LU).
Members of the RMT union were set to take part in two 24 hour walkouts on Tuesday (April 26) and Thursday (April 28).
But RMT general secretary Mick Cash said on Monday (April 25) that enough progress had been made in the dispute to suspend the industrial action by drivers.
"The hard work of RMT reps, backed up by the solidarity and determination of RMT members, has enabled us to make enough progress in talks over the issues at the heart of this dispute to allow this week’s action to be suspended and to allow for those talks to continue," he said.
"However, the dispute is not over yet and RMT pays tribute to the Piccadilly line members whose resolve has been instrumental in pushing the negotiations forwards."
RMT members, who are locked in a dispute over alleged bullying and harassment of staff, previously staged a one-day strike on the Piccadilly line in March .
Further strikes were initially planned to begin last Tuesday (April 19) and Thursday (April 21), but those dates were pushed back after progress in negotiations .
LU operations director Pat Hansberry said: "We welcome the RMT and ASLEF's decision to withdraw the strike action that was planned for this week.
"Both parties have engaged in constructive talks which have enabled us to reach an agreement on the way forward to resolve this dispute."
Previous Underground strikes have also taken place in a dispute over the planned Night Tube but the sides have resolved at least some of their differences and it is now hoped the round-the-clock weekend service could begin as early as this August .