London Underground drivers are to stage a 24-hour strike amid claims of a "fundamental breakdown" in industrial relations.
Members of the Rail, Maritime and Transport (RMT) union on the Victoria line will walk out from 10pm on November 27.
The line is one of the busiest on the Tube network, carrying hundreds of thousands of passengers a day.
The union warned that it will consider further strikes in December if the dispute is not resolved.
RMT general secretary Mick Cash accused LU management of reneging on agreements reached during talks.
"LU's actions are deliberately provocative and the announcement of action later this month is solely down to their childish behaviour.
"I have informed London Underground that the union remains available for talks to resolve this matter, but such talks have to be genuine, honest and based on mutual respect and trust.
"RMT representatives will not be treated with contempt by a management that says it has reached an agreement, only for them to rip up such agreements when the talks have concluded," he said.