Why is it that this thread has large numbers of posts trying to find reasons why a 1980's design modern Aluminium bodied train (D78 / 230) on 21st century bogies could not work, when clearly there is a shortage of DMUs.
whereas
Another thread devotes a large number of posts trying to find reasons why a 1970's designed mk3 / 1960's motored steel train (class 442) that can only run on DC where nobody wants it has 101 further uses, including a vivarail style project?
This forum in a nutshell
As I've said a few times, there are lots of services operated by 75mph DMUs (Pacers, Sprinters) where the unit never needs to get anywhere near 75mph.
Northern services from Sheffield to Leeds (via Castleford or via Bolton on Dearne), Huddersfield and Manchester all take around 1h15 to cover roughly forty five miles.
Forty miles from Sheffield to Scunthorpe and fifty miles from Sheffield to Lincoln take almost an hour and a half.
Seventeen miles from Knottingley to Leeds take around forty minutes, ten miles from Knottingley to Wakefield take around twenty minutes.
(and, yes, I'm no NIMBY; I accept that there are a number of local services around here that a 230 would cope with - not every route justifies brand new 100mph DMUs - if 230s come to Yorkshire then I'd accept that)
Given the number of stops on those services, a fast accelerating unit would probably operate the service faster than a Pacer/ Sprinter that never gets to use its 60mph capabilities.
There are a number of other Northern services that are tediously slow - do you need much 75mph running to match the 1h50 taken to cover fifty miles between Colne and Blackpool?
Since we are talking EMT... the Doncaster - Peterborough services take over two hours to cover ninety miles...
...the service they'll inherit from Northern requires fifty miles to cover twenty miles between Cleethorpes and Barton...
...it's 1h20 for the sixty miles between Grimsby and Newark...
...the thirty miles from Nottingham to Worksop take an hour...
...and over two hours to cover eighty miles between Nottingham and Skegness.
Take out the London services and the Liverpool - Norwich services and pretty much all EMT services (i.e. the 153 and 156 operated ones)
could be run by 230s. Not "must be", just "could".
Now, people can argue about whether a 230 is a suitable unit for such services (although since the TOC will be able to specify seating/ layout, you could configure them to suit long distance or short distance demands), but the "60mph units couldn't cope" argument is a bit weak in light of how many services don't require that running.
Don't worry though, this thread traditionally moves in circles - we'll be back to making snobbish comments about the "Transit Van" engines before long and the "top speed" will be conveniently forgotten about.
(as for the 442s... you've got to love the wild imaginations... well, sometimes...)