The RMT has said it will launch a week of action on the London Underground at the end of this month.
Running from the 23 to the 28 July, the move comes after a long running dispute between TfL and the Union over pensions, job cuts and “attacks” on working conditions.
RMT general secretary Mick Lynch said: “This week of action will shut down the London Underground and show just how important the work of our members is. Plans by TfL to cut 600 jobs and attack our members pensions are simply unacceptable.
“We are aware that Mayor of London Sadiq Khan has had the TfL budget cut. However, he needs to align himself with our union and his London Underground staff in pushing back against the Tory government, exposing their damaging agenda to a key part of London transport infrastructure.”
In response, TfL’s chief operating officer Glynn Barton said: “We are disappointed that the RMT has announced strike action on this range of issues that we have been attempting to discuss with them openly and cooperatively.
“We are urging the union to reconsider and engage with us to discuss the issues and seek a resolution.
“There are no current proposals to change pension arrangements and, although we are discussing with union colleagues a range of proposals to improve how London Underground operates, no employee will lose their job or be asked to work additional hours.”