Rail passengers could face months more of disruption after union members voted overwhelmingly to carry on strike action.
More than 90% of balloted RMT members opted to renew the mandate to continue industrial action for the next six months.
The RMT - the biggest rail workers' union - re-balloted its members at 14 train operating companies as its ongoing dispute over pay and conditions rumbles on.
General secretary Mick Lynch said the move sends a "clear message" to rail companies.
The union said 91% of members who cast their votes had backed renewing the mandate for another six months, meaning strikes could continue into the autumn.
Unions involved in disputes have to re-ballot their members every six months to legally continue with strikes and other forms of action.
Members of the RMT are planning to down tools on May 13 - the day of the Eurovision Song Contest final in Liverpool - after rejecting the latest pay offer.
It comes as train drivers from the Aslef union also confirmed three new strike dates in May and June to hit the FA Cup final and the Epsom Derby.
Mr Lynch said: "It is clear from these results that members are not prepared to accept a pay offer based on mass job cuts and major attacks on their terms and conditions.
"This sends a clear message to the employers that the huge anger amongst rail workers is very real and they need to recognise that fact, face reality and make improved proposals.
"They need to get around the table with RMT and negotiate in good faith for a better deal for rail workers."
On an average turnout in each company of nearly 70%, over 90% of votes cast backed continuing with strike action, the RMT said.
Do you support the rail strikes? Vote in our poll HERE to have your say.
The Rail Delivery Group lashed out at the union in a prickly statement after the announcement.
It said: "While the outcome of the ballot is disappointing, sadly it is also unsurprising during an on-going dispute such as this.
"The vote that really matters is for the deal on the table developed in conjunction with RMT negotiators but then subsequently rejected out of hand in unflattering terms by their executive committee, without giving their membership a single chance to have their say.
"The RMT membership would be forgiven for wondering why they are only ever offered a vote to extend this dispute and a never vote to end it.
"We can only assume that the executive committee is fixed on continuing this dispute for its own reasons, despite the damage is causing to an industry still being subsidised up to £175 million a month extra post covid, to our passengers' lives and to Britain's reputation for hosting high profile events like Eurovision.
"Instead of continuing to hold the country to ransom, we call on the RMT executive to quickly think again and put the deal - which offers job security guarantees and a pay rise of up to 13% - out to a democratic vote so that members can finally have their say."
