RMT will take a further 2 days strike action this Summer in a row over job security, pay and working conditions.
The strikes on August 18 and 20, will bring out over 40,000 workers across Network Rail and 14 train operating companies.
RMT is also taking 24 hours strike action on 27 July.
RMT general secretary Mick Lynch said: “The rail industry and the government need to understand that this dispute will not simply vanish.
“They need to get serious about providing an offer on pay which helps deal with the cost-of-living crisis, job security for our members and provides good conditions at work.
“Recent proposals from Network Rail fell well short on pay and on safety around maintenance work.
“And the train operating companies have not even made us a pay offer in recent negotiations.
“Now Grant Shapps has abandoned his forlorn hopes for the job of Prime Minister, he can now get back to his day job and help sort this mess out.
“We remain open for talks, but we will continue our campaign until we reach a negotiated settlement.”
