Leeds NW was a separate scheme from ECML, and frequencies under WYPTE had increased to Sunderland levels before electrification.
As InOban points out, the ECML job was pared to the bone to satisfy the Treasury (the south end of York was a prime example), and adding Metro Centre to Sunderland on loss making Regional routes would have been totally unrealistic, even as an afterthought (the ECML was approved in 1984, Metro Centre station opened in 1987 - and that itself was rather an afterthought, AFAIK).
They did manage to fund the thirty miles from Waverley to Carstairs (used by an electrified service every two hours or so - in an era when "Cross Country" services had a good share of 158s or HSTs), whereas thirty miles of wiring around Tyne & Wear would have had more bang for their buck IMHO.
To be honest instead of proposing Northern run a EMU between Newcastle and Morpeth, I would much rather they or Scotrail run a hourly EMU service (Edinburgh to Dunbar but extended to Newcastle) calling all stations between Newcastle and Edinburgh which would give the stations in between a decent service as well as improving connections for these stations at both Edinburgh and Newcastle which would also have the effect of speeding up the Intercity services too by not having them stop at stations apart from Berwick Upon Tweed
It sounds nice but (as discussed on the first page), it currently takes seventy minutes to do the forty six miles from Chathill to Newcastle on the existing stopper, (07:10 - 08:20) compared to around half an hour on a non-stop Long Distance High Speed (LDHS) service (passing through Chathill en route from Edinburgh etc). Add on another fifteen minutes (comparing the path of a ScotRail stopper and an InterCity from Dunbar to Waverley), plus maybe another fifteen minutes on the Chathill to Dunbar section?
All of a sudden the stopper is looking like 2h30 from Newcastle to Edinburgh rather than the 1h30 that InterCity services can manage it in.
If there are going to be four LDHS services per hour (two LNER, one XC, one TPE, to say nothing of the Open Access proposals) then your stopper is going to get overtaken several times by the "sped up" InterCity services.
If the line were four tracked throughout then I'd be in favour, but..
Not that much (I presume you mean the Metrocentre) but you would need to extend to the turnback point (slightly further west). Whether anyone would want to go to hell oops I meant the Metrocentre is another matter altogether.
Sorry, MetroHell is MetroCentre ... as anybody who has been there on a Saturday in December will surely testify! As to who will go there, the existence of such an option from Alnmouth in times past would enable Dad's taxi dropping young Miss Evening Star and her junior hordes at Alnmouth
We don't want to improve trains to a busy place like the Metro Centre - people might want to actually use them - much better to concentrate on linking remote villages instead (removes tongue from cheek)
Seriously though - as someone who was at the Metro Centre earlier this month - the place is obviously very busy - but it doesn't attract the same rail share that Meadowhall does - no direct trains from the Durham line, no light rail station, hourly at best from Sunderland/ Cramlington (but both Stagecoach and Go Ahead providing well loaded buses every few minutes into central Newcastle, thousands of cars clogging up the A1)... we really should be making more use of it's rail potential.