Trains between Leeds and Manchester have been affected by delays this morning.
Broken-down trains and signalling problems, including one near Manchester affecting routes between that city and Leeds, have caused morning rush-hour chaos which also affected those travelling to busy airports for the Easter holidays.
In northern England, trains run by First TransPennine Express between Manchester Airport and Leeds were among those delayed by a signalling problem near Manchester.
Northern Rail was also affected, with delays between Manchester Piccadilly station and Leeds.
Northern Rail maintenance driver members at Heaton and Neville Hill Traincare Depots in Leeds will stage a 48 hour strike today.
aThe workers, members of the RMT union will also implement an on-going overtime ban, in a dispute over regrading.
RMT General Secretary Bob Crow said: "RMT firmly believe that the company has been disingenuous in their approach by failing to recognise the multi-skills and the hard work that this group of maintenance depot drivers bring to the Northern Rail operation.
"The union is clear that the job is complex and demanding, and that now is the time for the company to acknowledge that Maintenance Depot Drivers should be re-graded accordingly in recognition of their role and responsibilities."
Rail union RMT says it will begin balloting all its Northern Rail members over strike action in a dispute over the use of agency staff for core railway work.
RMT is demanding an immediate end to Northern Rail casualising the workforce. If there is work that needs doing, it should be done by permanently employed staff on decent pay and conditions and not by an exploited, short-term workforce paid a pittance and denied the most basic of workplace benefits. The ballot will open next week and will close on Monday 20th May 2013. RMT remains available for meaningful talks.”
Northern Rail has launched a free app to mark its eighth birthday. The app will allow passengers to plan journeys throughout the UK, check live running time information and save details of up to 20 previous journeys.