Strike action's being take by Northern train workers today, for the third time this week.
Reduced timetables and replacement buses are in effect on the Lakes Line, as well as the Furness Line and out of Lancaster to both Morecambe and Settle.
RMT Union members have gone on strike as part of a long-running national dispute over driver-only trains.
They've already walked out Monday and Wednesday.
Sharon Keith, Regional Director at Northern, said: “Services will be busy as many people are returning to work and school after the Christmas break.
“We are doing all we can to keep our customers on the move and are focusing on running as many trains as possible between 7am and 7pm to get people to work and home again. Between these hours we will run more than 60% of our normal weekday timetable.
"We will also have replacement bus services available on some routes where trains aren’t running.
“We ask everyone to take time to plan their journeys carefully, allow extra time for travel and regularly check for service updates on our website.”
Details of the revised timetables, as well as other information about the impact of the RMT strike action, can be found here.