Amtrack and other rail is used high frequency the DC to Boston corridor
I used to take it a lot when I was in Manhattan
The non stop metroliner used to be now its something else
2 and a half hours at 120 bucks
Its quicker than going to Newark or la Guardia from midtown and then from national into downtown dc
God forbid Dulles or BWI
but beyond selected use areas its not in high demand
Acela.
I’ve ridden Acela.
You’re correct about speed/convenience if you’re going city center—>city center. It beats planes like a rented mule.