Same in the UK LON to EDR by train is more expensive than flying - and that's not counting the cost of peoples time for the longer train journey.
I do like the idea of the 3/4 day trip as part of a holiday
Maybe you would. We know from other countries that in general 5 hours is about the max time people will spend on a train before they choose to fly instead.
Because of air resistance planes are more fuel efficient as well for those longer trips (don't forget about energy lost to brakes when the train needs to stop)
> don't forget about energy lost to brakes when the train needs to stop
https://en.wikipedia.org/wiki/Regenerative_brake#Electric_ra...
I would actually pay a premium. This actually is reality today. Acela on the Northeast corridor is more expensive than comparable air fares and it's not even that good.