At Yahoo News has the following comment in an AP story
California high-speed rail gets green light - Yahoo! News
"The final cost of the completed project from Los Angeles to San Francisco is projected to be $68 billion."
If that is what 130 miles cost, you can't build very many miles even with the entirety of the 1.3 trillion noted in the
website linked to in post 21 on the war costs.
So if those cost projections are real, it can't be done on a large enough scale to help achieve our overall nationwide transportation needs.