Rail

Last month Casey Handmer attacked highspeed rail from the Left. This got a rebuttal. Meanwhile we all got to see at least the trailer for that fine movie Bullet Train (and we lucky few saw the actual film), showing us what a real choochoo looks like in a real country. Without taking a side on generalities, I'll propose a use-case.

One issue with highspeed flight is shared between supersonics and rockets: noise. Few people want to live near a Concorde. No people want to live near a SuperHeavy who's not actively working on one. But if we relocate our aeroport to the middle of New Mexico (or to Las Vegas for that matter) this takes away the time-savings for passengers, as they now have to waste time getting over there.

But if those Concorde passengers have taken the Bullet Train from a reasonable city at a reasonable distance, they've taken a few hours in luxurious comfort before boarding their highspeed flights to ... well, to some other desert. Where another Bullet Train is waiting to whisk them to their destination.

Meanwhile [h/t Zim] at the rocket / aeroport, service workers dwell underground. This might be a good place to train the Moonbound workforce, too; they'll be underground for much time as well.