Northern Rail bosses are being grilled by MPs over the cancellation of thousands of services since new timetables were introduced.
Managing director David Brown and performance and planning director Rob Warnes are among a number of senior rail executives hauled before the Transport Select Committee this afternoon.
Northern apologised for its performance in the wake of the timetable change last month, which led to the launch of an emergency timetable that cut more than 160 services every day.
The new timetable came as Transport Secretary Chris Grayling told Parliament "in the case of Northern I will not hold back from taking appropriate action if the review finds there has been negligent behaviour".
Rail commuters meanwhile face further disruption this week after the RMT Union announced its workers on Arriva Rail North services will walk out tomorrow, Thursday and Saturday.
The strikes are the latest in a series over the role of train guards amid plans for driver-only Northern trains, but union bosses claim guards are essential to keeping passengers safe.