Was thinking about this earlier today... There are some routes that are very unlikely ever to be worthwhile elecrifying. Far North Line & Kyle line for example. But when it comes to the WHL, it's already electrified as far as the Helensburgh Junction. Would there be any sense in electrifying the route as far as Oban, with a powerful EMU hauling a DMU as far as Crianlarich for the Mallaig run? I then got to thinkng about a posting earlier this week about DMUs hauling Mk3s... Could a suitably powerful emu, built from the start with an appropriate hotel supply and brake connection haul the Mk3 sleeper stock onwards from the central belt to Aberdeen and Inverness (should both cities eventually be wired up of course)?