Further Northern Rail strikes will take place for two days later this month as part of a dispute over guards and safety.
Northern Rail said they are unable to predict how long the National Union of Rail, Maritime and Transport Workers (RMT) strike will last, with more planned to take place on May 24 and 26.
On strike days the train franchise can only operate a limited service.
On weekday strikes the majority of available trains typically operate between 7am and 7pm, with many last trains leaving before 7pm.
During these hours the overall number of trains running are significantly reduced, with around 40% of the usual number of services in operation.
Northern Rail said: “We have again proposed to RMT that they set aside what appears to be a co-ordinated campaign in return for assurances over jobs and pay, and exploring with us what future roles will look like.
“We are frustrated at the lack of progress in talks as business and communities are behind our modernisation and investment plans and we want RMT to back this too.
“We want to talk about modernising with RMT, guaranteeing jobs and pay for our 1,300 conductors for at least the next eight years, until the end of our franchise.
“The more strike action continues the harder it is for Northern to give long-term assurances and commitments.”
RMT is also staking strike action at other train operators – Southern, South Western, Merseyrail and Greater Anglia.
Keep an eye on Northern Rail’s website for updates and information on effected timetables.