I figured this needed its own thread.
Why would the North East need the MMU's quite early on?
There's hardly much distance under wires covered as part of most diagrams up there, just the Newcastle - Morpeth part of the Morpeth - Carlisle and the few per day direct Darlington - Newcastle via Durham.
Buxton has been shown on Stakeholder Presentations for the first 8 4 car Battery units, which I think is perfect for them, plenty of time under the wires between Hazel Grove and Manchester (especially on the diagrams that do a mini-trip to Hazel Grove before going to Buxton). It looks like there are about 5 Buxton diagrams (hard to figure out with the peak time strengthening, which wouldn't be needed with fixed length 4 cars).
I think Windermere (and by extension Barrow[1]) are pretty clear contenders for Multi-Mode units, Windermere - Manchester Airport is 92 miles, only 10 of which don't have wires[2], and Barrow is 69 of 98 miles Electrified), which would free up 195s to cascade 158s (e.g. Wigan - Leeds) onto 150/156 diagrams to go to scrap.
The Southport services are prime for multi-mode trains, it already has them (they just need to not break down every day), I could easily see a 1 for 1 replacement of 769 by MMU (if they last into the 2030s)
In addition I think Sheffield-Leeds via Wakefield Westgate, with wires until Fitzwilliam / South Kirkby Junction (20 miles of 39 electrified) is in for a shot, but I think that depends on platform capacity issues at Leeds being dealt with so longer trains can be used.
[1] Future of this service probably depends on how the Whitehaven tunnel gets dealt with, that already has its own speculative thread.
[2] They shuttle back and forth to Oxenholme for 2 hours before going back, but they've got diesel engines if the battery drops too low and can top it up at Oxenholme if 60 miles without a charge is too far.
Anyone else got any ideas for good contenders for early replacement with multi-mode trains?