The problem is the equivalent driving times aren't crazy on those routes either though.
When you factor in that you need a car in both your departing city and destination city (except for NYC), AND the fact that nearly every household in those regions owns one or multiple cars (which is not true in higher density/higher urbanization countries)...it begins to not make sense especially given the massive upfront cost of construction.
That requires the area around rail stations to be built for pedestrians and bicycles, not cars. That doesn’t seem to be the case in many places in America.
I do take Acela from Central Massachusetts to NYC but mostly because I hate driving into NYC so much. (And don't need a car when I get there.) It basically involves driving an hour in the wrong direction to south suburban Boston. I could drive to New Haven and for a longer drive I'd get a shorter/cheaper trip.
When you factor in that you need a car in both your departing city and destination city (except for NYC), AND the fact that nearly every household in those regions owns one or multiple cars (which is not true in higher density/higher urbanization countries)...it begins to not make sense especially given the massive upfront cost of construction.