Rail workers at 14 train companies will strike on November 3 and 5 in the long running dispute over pay, jobs and working conditions, the RMT union announced.
It comes just a day after the RMT confirmed strikes would also go ahead on November 7 after alleging that Network Rail had “u-turned” on a pay offer.
The RMT claimed the rail company had “reneged on their promises of an improved pay offer and sought to impose job cuts, more unsocial hours and detrimental changes to rosters”.
RMT rail workers on the London Underground and London Overground will also strike on November 3 in a separate dispute over pay and conditions.
The strikes will cause widespread disruption to services across the country after a summer of strikes in the deadlocked row.
RMT general secretary Mick Lynch said: "Throughout this whole dispute, the Rail Delivery Group has been completely unreasonable by not offering our members any deal on pay, conditions and job security.
"Some of our members on the train operating companies are some of the lowest paid on the railways.
"This stands in stark contrast to rail operating company bosses making millions of pounds in profit.
"We remain open to meaningful talks, but we are steadfast in our industrial campaign to see a negotiated settlement for all our members in this dispute."
Network Rail on Wednesday called for union leaders to hold “intensive” talks next week in a bid to avert a fresh wave of strikes.
In a letter to RMT boss Mick Lynch, Tim Shoveller, Network Rail’s chief negotiator, strongly denied claims of a U-turn on a pay offer.
He wrote: “Nothing could be further from the truth. People were concerned to know if the current offer had been withdrawn and we simply confirmed it was still on the table.
“We remain open to additional ideas that would make us more productive and generate additional funding for pay.”
Mr Shoveller claimed that workers had been offered a 4 per cent pay increase in base pay backdated to January 1 2022, including shift pay and overtime, and a 4 per cent ncrease in base pay from January 1 2023.