More strikes are likely unless a deal on pay, job security and working conditions is reached to end the dispute.
Passengers could face another six months of strikes, after a vote by thousands of rail workers.
The union said just over 91% of votes in its latest ballot were in favour of further strikes, with the average turnout 70.2%. It said more than 40,000 members had been balloted. "Further counterproductive strike action would only heap more misery on our customers and struggling businesses in the run up to Christmas, and continue to undermine the viability of an industry we all want to see thrive," said Rail Delivery Group chair Steve Montgomery.
Tim Shoveller, Network Rail's chief negotiator, said "What's clear for all of us is that striking is not changing the railway's precarious financial position, but actually only making it worse. The railway has not recovered from the pandemic and is currently losing millions a day, which makes reaching a deal both tough and essential."
A major part of the RMT's dispute with Network Rail is a plan to change how the organisation's maintenance teams work, involving 1,900 job cuts.
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