I got a 331 the other day, absolutely beautiful!
4 car trains appear to have been deployed on MAN - Blackpool N Pole, giving a really ideal uplift in capacity!
Train lengths up from ~79.5m on 319's to ~ 95m with 331's. Really ideal, as the Bolton - Airport leg is always super overcrowded. Faster acceleration and more seating/standing room should reduce dwells and time between stops, once the door release times improve! Hopefully this will allow them to keep time and reduce knock on delays through Castlefield.
A little bit of investment should go a long way in the North, god knows we've needed it.