The RMT has announced a fresh wave of industrial action ahead of a decision today on who will replace the late Bob Crow as the union's General Secretary.
The action comes as part of a long running row over ticket office closures. The RMT is accusing London Underground of being "hell-bent" on carrying out a programme of ticket office closures and job cuts despite months of talks.
Plans for an overtime ban and other forms of industrial action were suspended earlier this month, but members will now ban overtime from Wednesday until further notice.
Voting to decide who will replace Bob Crow as General Secretary of the RMT (Rail, Maritime and Transporters Union) Union ends today.
Mr Crow, who was from Shadwell in East London, died earlier this year. During his time leading the union managed to increased membership by 20 thousand.
Five people are running for the post, including Acting General Secretary Mick Cash.
The RMT and other transport workers' unions will hold a demonstration at Blackfriars Station protesting the newly merged Thameslink, Southern and Great Northern franchise. They say the contract, awarded to Govia Thameslink, will see cuts to station staff numbers and ticket office closures.
Transport union the RMT is gathering its members together in central London as part of its campaign to halt cuts to Tube services.
The plans outlined by Mayor Boris Johnson include cutting the number of station staff, closing ticket offices, and introducing driverless trains.
The RMT says the austerity measures will not only mean job losses, but impact on safety and services.
The event aims to inform trade union members as well as the public about the issues and to discuss the next campaigning steps.
A planned tube strike by power workers on London Underground has been called off. Union members were due to walk out over the Bank Holiday weekend in a row over pay and conditions which could of disrupted services.
We ran a regular service for our customers during the last RMT strike at the end of April, and we will do it again this time.
The RMT's misguided decision to strike again ignores the reality that Heathrow Express needs to save £6m of cost over the next five years in order to secure its future and jobs for its people.
Burying one's head in the sand does not alter the fact we need to implement changes to secure our future. We would of course prefer to do this with the agreement of the trade unions to ensure the best outcome for everyone, including RMT members.
According the the union, Unite, London Underground faces the prospect of a complete shut down this Bank Holiday weekend as workers, who control the power to run the trains, prepare to strike.
Unite regional officer Hugh Roberts said:
"There is a real possibility that the underground could close down over the bank holiday weekend. Unite is working very hard to achieve a fair settlement for our members - and to avoid the industrial action. The ball is very much in the management's court."
Unite, TSSA and RMT have raised a number of issues with us around workplace and terms and conditions relating to staff in our power control team, all of which are either being addressed or we are happy to discuss.
We are disappointed that the unions have chosen to call strike action and we would urge all unions involved in this dispute to continue discussions to resolve this matter without the threat of industrial action.
- 40 technicians, mostly members of the Unite union, are based at the power control room in Blackfriars where they provide the power for the 270 station underground network
- Talks are being held today between the unions and London Unerground management to resolve the dispute before the strike starts Saturday, and ends at 8am on Tuesday
Rail and Tube workers will stage strikes over the Bank Holiday weekend in separate disputes over pay, jobs and conditions.
RMT members at Heathrow Express will walk out for 24 hours from 3am on Friday, and again from the same time on Bank Holiday Monday. Unite union power control staff on London Underground will also strike for three days from Saturday in a dispute over pay and conditions.