Since the entire 323 fleet would not be replaced, you would have sufficient units to maintain the services which currently require 90mph performance.
The trains would be used on services like those to Hazel Grove and to Glossop and Hadfield.
We are only looking to free a handful of units.
So you're solution for not giving SWT a micro-fleet is to give Northern a micro-fleet instead?
There's only one EMU that runs to Hazel Grove every day. The Hazel Grove EMUs were robbed for extra hourly Airport-Manchester and making the Stoke-Manchester service all day in 2008. Most Hazel Grove services continue to Preston now and in the evening peak there's a Piccadilly-Hazel Grove-Chinley service so even if you get more EMUs there's little provision for using them on Hazel Grove services ahead of Bolton electrification.
Also, it would be beneficial for any services which do not call at Heaton Chapel and Levenshulme to be 90mph capable giving the pathing shortage in that area regardless of whether or not they only do a 25 minute run between Manchester and Hazel Grove.
Why? the routes I propose mainly consist of short journeys.
For no toilets you need short journeys
and frequent services like Merseyrail. It's no use telling someone in somewhere like Congleton or Holmes Chapel that they can wait until they get to Manchester to use the toilet if the frequency is only hourly (or 2 hourly on Sundays) and there may be a chance that the next train is delayed or cancelled.
As many services to the South and East of Manchester already consist of 20m or shorter carriage units, this is surely not a gamebreaker.
Yes just take the adequately sized trains on the few routes that have them and replace them with shorter trains that are too small so they can be overcrowded just like the other routes.
The 323s are probably the highest capacity train (compared to number of carriages) currently on the UK network and they've got more standard class seats than the 5 standard class carriages on 9 car Pendolinos and a similar number of seats to the 4 car 350/2s. If they are ever replaced on their current routes a lot of thought and consideration needs to go in to what would replace them - just any old 3 car EMU is not a solution. Just like you can't replace the 166s with a 3 car 144.