Northern has advised its customers in the North West to ‘Check Before You Travel’ on Sundays in December due to planned engineering works and the potential for short notice cancellations.
It comes as Northern is proposing to introduce an amended Sunday timetable in the North West next month.
The train operator says it is to provide passengers with more certainty about those services it will be able to run and to reduce the number of short-notice cancellations.
The amended timetable, which Northern hopes to introduce from Sunday 22 December, will have fewer services on Sundays in the North West.
The proposed changes to the Sunday timetable comes after RMT members rejected Northern’s enhanced four-month pay offer for conductors to work on Sundays during a recent referendum vote – an offer that would have seen them double the money they get for working on Sundays.
The situation with conductor availability is expected to worsen over the Christmas period, with fewer conductors volunteering to work extra shifts or overtime.
Network Rail has also announced engineering projects will affect services on various routes across the Northern network.
If Northern is forced to cancel services, it will look to provide rail replacement services for customers where possible.
Matt Rice, chief operating officer at Northern, said: “We are disappointed that our offer for conductors to work on Sundays was rejected and we would like to say sorry to everyone in the North West who will be affected by this disruption in the run up to Christmas.
“We believe the deal that was put to RMT members was fair and reasonable and, if it had been accepted, would have improved reliability in the short-term while we worked with the RMT to secure a longer-term agreement.
“Despite this setback, we will continue to work with colleagues and the RMT union to find a new way forward.