If it's a definite improvement why is the opinion of passengers who actually use the services mixed?
For the same reason that there is a mixed view from passengers on our nice shiny new 387s on Thameslink, - that's what people do.
Do you actually know which services are switching to 319s, what used to operate the services and what loadings were like? Your post seems to suggest not.
There are plenty of posts from those on here who have regularly experienced the mixture of DMUs that run the services on the NW electrification phases 2, 3 & 4. As I have posted in replies to you in the past, I accept that the 142s, 150s & 156s are slow, noisy, (usually too short) and sometimes unreliable. The 319s with which I am very familiar, have for the last decade carried loads far greater than anything expected in normal service in the NW and although not the most comfortable, have done this without the space wasting of full-size 2+2 seating and tables in a high-volume commuter train.
Manchester/Wigan to Liverpool services won't be able to run at anywhere near 100mph. 2 carriages are sufficient on a number of services while some of the 4 carriage workings were 4 car 156s - approx. same number of seats as a 319 but with the added benefit of 2+2 seating and tables. While for the services which were 2 car 142/150s they are an improvement for passengers travelling on those services but it does mean some services jump the queue for extra capacity.
I didn't mention 100mph running, I said "linespeeds" and that was in the context of reaching and maintaining such speeds for longer than the DMUs that they are replacing. I have actually ridden in a 319 from MIA to LIV and it did travel at 90 mph for as long as the linespeed limits allowed.
The 319s can carry as many passengers (maybe more) as the 156s and their dwell times are much shorter. If the much promised 'Northern Powerhouse is to be more than a politician's election bribe, you can expect trains to be fully loaded in the peak hours. If the demand increases, the 319s will be able to deliver and the phenomenum of passengers left on the platforms should probably be a rare exception. That additional demand should ensure that additional investment is there to provide higher capacity when the 319s are life expired.
Northern have some round holes to fill and they've been sent some square pegs from London.
Commuters rarely fit the holes available for them. Just when the correct holes are provided, they change shape.
