I have photographic evidence of class 86 hauled Edinburgh - South West services on the ECML in the early nineties, but they must have been sporadic and short lived (As you know, at that time Crosscountry services to Edinburgh via the ECML were far more sporadic and pretty much exclusively HST worked) as I never saw such a thing personally
Fair enough - as someone from eastern Scotland who has lived most of his life in Yorkshire, I've been up and down the ECML a few times and have no memory of electric traction on any "Cross Country" services - but if it happened then it happened.
At least as a temporary fix your plan could work, before any new bi-modes could be sourced. The 2TPH south of Manchester are a bit of a joke being only single unit Voyagers, given how much traffic there is between Manchester and Birmingham. I feel that they could quite happily be 8-car Voyagers. A 67+Mk.4s with more seating, even if only on the Bristol run, could make a huge difference.
It's ridiculous that two of the biggest urban areas in the UK are so badly connected - e.g. we have five or six services per hour from Manchester to Leeds (soon to be upgraded to include Mk5s and 5x26m 802s), I've lost count of the number of services from Edinburgh to Glasgow each hour, but when it comes to Manchester to Birmingham the two cities are expected to cope with Voyagers (which have about the same number of seats as a three coach 158) until HS2 arrives in another decade or so!
I guess the difference is that Edinburgh to Glasgow is wholly Scottish and Manchester to Leeds is wholly "northern" but Manchester to Birmingham falls between two separate regions so doesn't have the political clout to make as much noise.
But it's yet another example where the tiny number of people travelling from Manchester to Southampton/ Exeter each hour is more important than the number of people travelling from Manchester to Birmingham - we could stick some eight coach 110mph EMUs on most Manchester - Birmingham services, use the spare Voyagers to double up other services and keep a couple of token direct services a day from Manchester to Southampton/ Exeter but nobody seems interested - as with many other areas, the small number of long distance passengers take priority over the large number of people doing shorter journeys on a regular basis. Frustrating!
Surely the big issue preventing any refurbishment of the crosscountry voyager fleet is the current state of the franchise. As the franchise has been given two short term direct awards is stopping any improvements to the fleet
This is the problem - and one which has affected Northern/ EMT/ Wales & Borders etc over the years.
Compare franchises unable to invest in badly needed new stock (Virgin West Coast, South Eastern etc) with those able to do so (the plans for Merseyrail and ScotRail - infrastructure problems in the central belt notwithstanding). It's what politicians would call a "postcode lottery"...
If a TOC isn't compelled to make long term improvements (and, to be fair, a TOC surviving from short term extension to short term extension won't be bothered about making investments that'll take a decade to pay off) then we will be stuck with stagnating franchises.
If privatisation worked properly then we'd have a brand new franchise every (say) seven years or so, we'd have two or three TOC awards each year, each with promises of improvements. We could have a planned timetable spread around the country, so that the "Intercity" TOC in an area introduced their new fleet or increased their frequencies and then the "Provincial" TOC in that area did the same three years later, so there were continual improvements.
Instead, we've had a large chunk of the railway map kept stagnating because the political environment is too uncertain to make new awards or the Government are too busy or nobody wants to have to take the tough long term commitments.
It feels like the privatisation model might work if we actually tried to do it properly - instead we've had a lot of TOCs stuck in a holding pattern since the 2004-2007 period (which seems to have been the last time that a lot of big franchises were properly done).