Contingency plans have been drawn up as rail companies prepare for planned strike action over the Bank Holiday, Network Rail has said.
Amended timetables will be available on Sunday if last-ditch talks aiming to prevent the 24-hour walk-out from Monday afternoon fail.
Network Rail chief executive Mark Carne said he believes an agreement can be reached.
We are continuing to talk with the unions and we believe there is a settlement to be had. I sincerely hope we can reach one and my team will be available all week, and into the weekend if necessary, to find a deal to prevent strike action.
From the very start of negotiations we made clear that we want to reward our staff for the incredible job they do, but that any pay rise needs to be linked to smarter, more effective ways of working.
We can't bank on the unions calling off the strike, so we are now concluding our contingency plans so passengers can make decisions about their journeys.
If the strike goes ahead, it's important that people check before travelling and are aware of the special measures put in place by train operators for people who have already booked tickets.
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