Let's see... train from LA to NYC at 200 MPH is a quick little 14 hour train ride... or about 3 times as long as a flight.
This is assuming it's a straight line. With no stops. And no hills/mountains.
And that's two cities in the US. Next I need to get to Minneapolis. And DC. And Miami. And Omaha, Nebraska.
This is gonna be one hell of a train system. We need to build this system without cars, machines, or oil because that would be bad. Better get to work.