That'd be a waste of resources - why electrify the line and then run DMUs from Manchester to Oxenholme...
Because initally (Between 2015? and 2019 when it's finished) they will be running the route via Bolton. As to retain an hourly fast Airport - Picc - OR - Bolton - Chorley - Preston - Lancaster service. In addition to this, some of these services avoid Chorley and run non-stop via Wigan North Western, route knowlage, now IMO this route should be wired next into North Western and Wallgate, with the 3rd rail extended on the merseyrail routes into Wallgate, then isolate the Atherton Line as a diesel island terminating services at Wallgate and run via. Bolton terminators onto Kirby and Southport, Dual Voltage stock anyone?
Eventually TPE should be getting electro-diesels anyway, well, in the world of common sense they would for TPE North...
Add into the mix as well that these diagrams are shared with stock that runs to Barrow In Furness, same problem with ONLY wiring to York for the current timetable, the off Newcastle service turns round to form the Middlesbrough Service at MIA and vice versa.
TPE should keep the 185s anyway, even IF the TP route gets wired, the're still going to need a shed tonne of units, IIRC growth is expected to mean that 9 or 10 car units are needed within a few years anyway. That could see 180s used on Newcastle and Middlesbrough runs, and 185s on Hull and Scarb. Detaching coaches where not needed at Selby (re-instate a centre line to cross between platforms) and York.
Yes the're not ideal, they could do with through gangways and being 4, 5 or 6 coaches long to start with, but the're damn good at making up time, and I like them.