I really don't think the HST2 will have any impact on the Cork-Dublin project. They simply need powercars, there are a few pretty much off-the-shelf sollutions out there.
Irish Rail plan to use the new CAF coaches for 125mph operation on the Cork-Dublin line. They're fully designed to operate at that speed and that's always been the plan. It's just a matter of a minor tweak to the brake systems and something new to power them.
It's quite unlikely that the UK's HST2 programme will be anything other than a big purchasing campaign of something relatively off-the-shelf too. There are many suitable candidates already designed and in use in the UK.
I really can't see the point of a major upgrade to enterprise. It neither has the population, demand, distance or tracks to make it worth while.
It could benefit however, from a bit of a tweak and perhaps power cars too.
Otherwise, a 125mph tilting DMU might be the best sollution.
I still think it was madness that the Cork-Dublin fleet doesn't tilt!
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