A group of Yorkshire MPs say they expect to see major improvements to TransPennine Express rail services from today.
Rail commuters in the north of England were hit by cancellations and delays when new winter timetables were launched last week.
Conservative MPs Kevin Hollinrake (Thirsk and Malton), Robert Goodwill (Scarborough and Whitby) and Jason McCartney (Colne Valley) say they demanded urgent changes when they met TransPennine boss Leo Goodwin.
Mr Goodwin said he was "really sorry" for the disruption to customers at such a busy time of year.
He said: "Due to issues with crew training, caused by the late delivery of some of our new trains, along with a maintenance backlog and some infrastructure issues, we had to implement a temporary timetable."
Mr Goodwin says the introduction of new trains should see an improvement to people’s journeys.
Kevin Hollinrake MP says: "We've seen one-in-five trains cancelled or significantly late, so we've said we must see a tangible improvement .
"What they've agreed to do is reduce that by 50% by January."