There's a bigger gap between the 75MPH that normal Amtrak trains operate with at peak speed and the 130MPH the Acela does than there is between the Acela and a European high-speed train. Also: high-speed rail is going to go where the Acela already is, and the Acela is already fast enough to be viable and competitive. So, I kind of doubt train technology is going to make a huge difference.