To try and put the Bi-mode argument to bed, can I say that I agree with both sides of the argument. When they were ordered the reasoning behind the order was electric trains with a get you home diesel fitted. Since the electrification schemes have gone belly up, through luck not judgment Daft has found an easy way out by using the idea of more diesel engines a la the order for the South West of England.
So now they can deliver Shiny new trains, save the charges for the trains hanging round in sidings and every ones a winner especially Daft. Sadly not totally true because Hitachi will want paying for the extra work, many of the electrification projects will be put on the back burner and Daft have N.R. to blame ( though it's true they did have something to do with the debacle ).
So to conclude it's luck more than judgment that Bi-modes have saved the day like most of the stuff that Daft does.
Head down and waits for incoming.