Rail commuters have been affected by numerous cancellations and delays as Northern launched a new timetable which had promised 50 new trains.
Nineteen trains had been cancelled by 10:00 GMT and 31 delayed, some due to a shortage of drivers.
Transpennine Express had also cancelled 29 services on Monday morning.
One passenger, posting on Twitter with the username leylandski, wrote: “Every day you get worse. Now you’ve cancelled both my train to and from work until Jan? Why? They were during peak time, this is totally unacceptable.”
In October, fewer than half of Northern rail services ran on time, the firm’s figures showed.
Cancellations were also at their highest level since July and August.
The operator had said the changes in its new winter timetable would focus on “reliability and stability” and add to the services each week.
On Monday, a Northern spokesperson said: “The new timetable for Northern has performed well.
“The small number of delays and cancellations are due to operational issues including driver sickness, signalling failure and train faults.”
Commuters took to social media on Monday to share issues with train travel, as the hastag #northernfail was trending.
Calderdale councillor Jane Scullion tweeted: “Good morning @northernassist, trains late, trains cancelled, two carriages, not stopping at various stations, standing from Hebden to Leeds. I could weep and it’s only Monday morning #northernfail”
Keri Lewis Brown shared an image of a departures board which read a service to Blackpool North had been cancelled “due to a train stopping in the wrong position”.
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