Three days of planned rail strikes from Saturday have been suspended at the eleventh-hour, RMT union has announced.
In a surprise move the union said it has secured "unconditional" talks with Network Rail and the promise of an offer from the operating companies.
Members of the RMT had been due to stage 24-hour walkouts on Saturday and next Monday and Wednesday in a long-running bitter dispute over jobs, pay and conditions.
But the union will now enter into a period of "intensive negotiations" with the firms.
It said the dispute remains "very much live" and it is continuing its re-ballot of members to secure a fresh mandate for action with the result due on 15 November.
RMT general secretary Mick Lynch said: “The threat of strike action and our strongly supported industrial campaign has made the rail employers see sense.
“We have always wanted to secure a negotiated settlement and that is what we will continue to push for in this next phase of intensive talks.
He added: “Our priority is our members, and we are working towards securing a deal on job security, a decent pay rise and good working conditions.
“Our re-ballot remains live and if we have to take strike action during the next 6 months to secure a deal, we will.”
But Network Rail's chief negotiator Tim Shoveller warned there will still be disruption to services over the weekend.
He said:"It's welcome news that the RMT has called off its strikes but the very late notice means that services for tomorrow cannot be reinstated and will remain extremely limited, and while we, and our train company partners, will work without pause over the weekend, there will be limited ability to change the 'strike timetable' for Monday.
"Our advice remains to please check before you travel and on Saturday and Monday and only travel by rail if absolutely necessary.
"We look forward to getting back round the table with all our trades unions early next week to see if the progress made this week can be built on, and a resolution found."
A spokesperson for the Rail Delivery Group added: "It is positive that the RMT leadership have stepped back from the brink and called off their strike action.
"Unfortunately, the late notice means that while train companies are working hard to reinstate services, they will remain severely disrupted for our passengers tomorrow and into the early part of next week.
"Our advice remains to please check before you travel and on Saturday and Monday only travel by rail if necessary.
"We remain committed to intensive negotiations to agree the reforms needed to improve reliability, deliver a pay rise for our people and get the industry back on a sustainable financial footing."
