$200 million per mile for 1400 miles is $280 BILLION.
That’s what the federal government would want to charge to build such a railroad, to be sure. Private companies can do it for less than a twentieth of the cost, if so high.
Of course, the FRA would institute maddening requirements that no other high-speed railroad has, including 30-foot track centers (distance from center of one track to the other), among other things.