Northern expects around 35 per cent of it's services to be running tomorrow as passengers face more rail misery through strike action.
The Rail, Maritime and Transport (RMT) union is staging another walk out in a long-running dispute over the axing of guards on trains.
Northern, which operates services between Skipton and Leeds and Ilkley and Leeds and Ilkley and Bradford warns that a limited timetable will be in operation.
Last departures from Skipton will be at 4pm for Bradford Forster Square and 6.47pm for Leeds.
Paul Barnfield, regional director of Northern, said: "We are doing everything we can to keep customers on the move on Saturday, but unfortunately the planned strike action will severely limit our services.
"We ask customers to plan their travel carefully."
Mick Cash, RMT general secretary, said the union opposed the introduction of so-called Driver Only Operation over fears it would jeopardise safety.
Northern customers will be able to use their tickets on Arriva Bus services across the north of England for journeys they would otherwise have made by train.
A spokesman said Northern expects to run around 35% of its normal services on Saturday. Using Arriva Bus services, including Yorkshire Tiger, Northern’s customers can use buses in much of the North East, Yorkshire, Merseyside, Cheshire, Lancashire and Greater Manchester.
Northern has also announced there will be more than 300 additional rail replacement buses to provide travel options for customers who do not have rail services in their area during industrial action.
The operator says all its services – train and rail replacement buses – are expected to be extremely busy and advises customers ato give themselves extra time to travel and consider whether their journey is necessary.
Please check before you travel, the company says.
Customers can get the latest travel advice by going to Twitter @northernassist or by checking www.journeycheck.com/northern.