Do you not get that now anyway, only in reverse with being pulled along by the Cl57 on the current sleeper trains?
Not that I was around when they were running the more I think of the sleeper service being within an DEMU set, the more I think that it maybe best to be similar to being like the old Blue Pullman Trains or even the current HST trains where the power whether it is electric or diesel are as separate locomotives which would I believe actually in the long term make it easier and cheaper to maintain.
You do indeed, which is what Sir Peter Houlsdon was getting at.
My feeling on the matter is that whatever is used to replace the current stock has got to be, to some extent, off the shelf. Otherwise we're going to be going back down the road of the 180s. If theres is bespoke stock, I can see a situation in 20 years where life extension is required, but where the stock ends up being scrapped because the costs are so prohibitive.
Whether that means using parts from current designs or larger elements, eg unpowered EMU trailer vehicles forming coaching stock, I dont know, but I think whatever solution is chosen must consider these whole of life costs. We don't want to be back in this situation in 20 years.