Oh but with bi-modes they'll have the excuse to give up halfway!
Excuse me for having a contrary opinion to you, I do sincerely apologise.
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The thing is there will only ever be a limited number of bi-modal trains needed, as such once one company gets a design to market with a substantial order (I.e. IEP) then it is going to be more difficult for another company to get a design to market that can compete on price. As such there will be limited players in the market.
There will, for some time yet be routes where a pure DMU will still be running substantial distances off the wires and so there is little advantage in having only bi-modal and EMU trains.
Even with all the 22x's potential becoming spare we could still see XC ordering bi-modal trains as the 222's will not be freed up soon enough and the ICWC 221's may not all be released. As such (depending on what SWT do for the WofE services) you could see the 22x's going to Chiltern, Scotrail and possibly SWT in the mid 2020's as longer sets (scraping end coaches).
You have to bear in mind that we are currently needing to order a lot more units than we are getting rid of just to keep up with passenger demand, as such there could well be need for a lot of bi-modal, DMU and EMU trains over the next 10 years.
You also have to remember that very few people have traveled on a bi-modal train and so TOC's may be cautious about having them.
You might want to tell Haydn1971 that. I believe he has visions of the railway network being dominated by bi-modes.
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I've seen no evidence that there will be more than one step up into the carriage: From the platform to the train, like just about any other train.
Expect the fact that it has already been documented that there is a considerable step from the platform into the vestibule and then a ramp up into the seating area. So the high floors are considerably higher than the platform.
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I'm not sure why you feel it necessary to separate out DfT sanctioned and TOC ordered Bi-modes. In total, 545 carriages worth of bi-mode trains have been ordered, either as part of the IEP deal or subsequently by First (that's not including any prospective TPE order, as we don't know for sure yet). That's not so far away from the total number of 723 production HST carriages that were originally constructed. In total, over a thousand AT-300 vehicles, of bi-mode and electric variants, have been ordered to date (not including the earlier 395s).
Because as we know the DFT made the decision after it was made apparent the TOC's would not go for the decision the DFT wanted! So the only bi-modes to be ordered by a TOC are the comparatively small number First have ordered.