The RMT union has announced two more days of rail strike on August 18 and 20 followed by employment, pay and working conditions.
The action will see the departure of more than 40,000 Network Rail workers and 14 train operating companies.
RMT also plans to go on a 24-hour strike on July 27.
Secretary-General Mick Lynch said: “The railway industry and the government need to understand that this dispute will not simply go away.
“They must be taken seriously when offering a salary offer that helps to cope with the crisis of the cost of living, job security of our members and provides good working conditions.
“We remain open to talks, but we will continue our campaign until a negotiated agreement is reached.”
Andrew Haines, chief executive of Network Rail, said: “By announcing even more strike dates, the RMT has dropped any claim that it is a matter of reaching an agreement.
“It is clear that the best interests of passengers and our staff are taking second place in the political campaign of union leaders.”
The companies involved in the RMT strikes are: Network Rail, Chiltern Railways, Cross Country Trains, Greater England, LNER, East Midlands Railway, c2c, Great Western Railway, Northern Trains, South Eastern, South Western Railway, Transpennine Express, Avanti West Coast, West Midlands Trains and GTR (including Gatwick Express).
Earlier, drivers from the Aslef union – who work for eight railway companies – announced they would go on strike on July 30.
Mick Whelan, Aslef’s general secretary, said: “We don’t want to go on strike – the strikes are the result of a failure in the negotiation – and this union, since I was elected general secretary in 2011, has only been in until this year, for a handful of days.
“We don’t want to upset passengers, especially because our friends and families also use public transport and we believe in building trust on the railways in Britain, and we don’t want to lose money by going on strike.
“But we have been forced into this position by train companies, driven by the Tory government.
Aslef members in eight companies – Arriva Rail London; Chiltern Railways; Great England; Great Western; Helmet Trains; LNER; South East; and West Midlands Trains: will join the strike action.
Read more: Network Rail makes new pay offer to workers after strikes, but RMT union calls it a “pay cut in real terms”
But Whelan said Greater England drivers would also go on strike on Saturday 23 July and Hull Trains drivers would also go on strike on 16 July and Saturday 23 July.
More votes close at Avanti West Coast and CrossCountry on Wednesday, July 27; and the Northern Trains; TransPennine Express; and Transport for Wales on Thursday, August 25, he added.
Transport Secretary Grant Shapps said: “It is incredibly disappointing that, just three days after their polls closed, Aslef’s leaders have already opted for a destructive strike, rather than engaging in constructive talks.
“Not only that, but by seemingly coordinating strike dates around the Commonwealth Games, it’s clear that union leaders are determined to cause as much misery as possible and derail an event the whole country is looking forward to.