Negotiations between the National Union of Rail, Maritime and Transport Workers (RMT) and rail companies have hit a dead end, the former said on Thursday.
“No new document has been produced” by the Rail Delivery Group (RDG) since RMT suspended planned strike action on March 30 and April 1, leaving members “frustrated” according to the union.
It had cancelled the strikes after a proposal made by the RDG on March 22, but suggested talks had ground to a halt since, with re-ballot papers being sent to members from Thursday.
“While negotiations continue, we remain in dispute and resolute in our determination to win a further mandate for strike action in the upcoming re-ballot,” said RMT.
“Be in no doubt, if further strikes are needed, RMT will not hesitate to act.”
Though Britain’s railways will be free of strikes over the Easter weekend, action by Heathrow airport security staff and French workers across the Channel have looked to disrupt travellers.
Dubbed “Black Thursday,” French workers have launched their eleventh day of strikes in response to proposed reforms to lift the state pension age by two years to 64, causing disruption to those crossing the Channel.
British Airways reportedly had to cancel 20 flights planned to pass through French airspace as a result of the mass walkouts, adding to some 300 flights already axed ahead of strikes by 1,400 Heathrow security staff from terminal five.
Heathrow reassured it was “operating as normal” on Wednesday after the security strikes began on March 31, though Unite union regional officer Wayne King said the strikes, set to continue until Sunday, April 9, would "undoubtedly" cause delays.