Among "the alternatives" that rail has to be better than: Busses using the existing highways. They won't be as fast as high speed rail, but they will be (in most cases) faster than non-high-speed rail, and the infrastructure costs will be massively less. Also, we can implement the plan this year, not a decade or three from now.

Busses have a bad reputation, as being ugly, uncomfortable, and smelly. So do trains, but with high speed rail, you buy some really nice trainsets. Well, for much less than the cost of rail right of way, you could buy some really nice busses.