Northern's new fleet of trains are less reliable than the heavily-criticised Pacers they replaced, figures show.
Rail industry figures show the breakdown rate for the company's £500m 101-strong fleet is higher than for the 1980s-built rail-buses.
Northern passengers have long been plagued by delays and overcrowding.
The failing rail operator, which is being taken over by the government next month, said it was 'working hard to improve performance of the new trains.'
Figures show the new £500m trains have a higher breakdown rate than the ageing Pacers.