The 350s do not make any 185s available to free up any 170s for cascade elsewhere
That was what I was thinking.
With DfT trying to avoid new DMU orders I doubt they'll be many (if any) DMUs from the North going South unless a similar number of replacement units are sourced e.g. Anglia taking on the TPE 170s and releasing their Sprinters to Northern.
If units released by electrification in the North start going to other parts of the country for extra capacity then we'll need a large DMU order to be placed in around 2017 so there is something to replace the life expired Pacers. The DMUs displaced by North West, Thames Valley and Great Western electrification are needed for extra capacity in those areas plus the eastern side of the Northern franchise. It's only when Valley Lines and North TPE services go electric that we can start withdrawing old DMUs (except maybe the small fleet of GW 143s can go sooner.)
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The 319/2s have a much better interior specification but are in a poorer state. .. There still much better than much of the Northern fleet. Think a 150 with original seats, just in a much nicer condition with no engine noise.
And this is the standard of interior you'd expect to see on Liverpool-Manchester Airport services (which are set to get the first cascaded 319s) currently:
http://s1266.photobucket.com/user/jossrankin/media/After.png.html
While Northern's 142s and ex-LM 150s don't have nice interiors, that's less than half their fleet. Northern have:
* 27 x 150s which have had a full refurbishment
* 113 x Super and Express Sprinters (153s, 155s, 156s and 158s)
* 41 x post-1990 EMUs
Compared to 79 x 142s and 33 x 150s which retain the original interior, with the 10 ex-ATN 150s having had a decent refresh. (They also have 23 x 144s which have had full refurbishments.)
The objection to Northern is that they've not invested in any full refurbishments to the trains that still have the original interiors, not that all the trains they have retain their original interiors.