do caf build bi-modes not too familiar with them northern should say stop to these 769s too much money ploughed in to them more 331s will be the perfect answer for northern routes
Northern have more than enough EMUs and more can be cascaded if needed.
Any CAF bi-mode for the UK (I'm not sure they have anything suitable) would be 2-3 years away and need lengthy testing like the 195/331s.
Stadler build decent bi-modes, as at Greater Anglia (about to enter service).
I should think Northern will look there if they can afford any (which I doubt).
Meanwhile, the DfT will be exceedingly angry if the 769s don't work, as I believe they are footing most of the bill for the initial development.
The same people are working on hydrogen-powered options.