Funnily enough, this very morning I read that Manchester Mayor Andy Burnham has called for an official investigation into Northern, saying that their performances aren't good enough. Reading through the feedback on Twitter, it's pretty damning. Not just the ancient rolling stock but the attitudes and equipment of staff; customers being made to purchase a second ticket on the train at full price because the conductor doesn't have a barcode reader to scan a mobile ticket.
For what it's worth, Northern still have
102 Pacers in their fleet as well as 190 Sprinters, which aren't exactly great either.
How railway travel works in Great Britain: