The NE works because of the high population density. But that's not the only formula for success - the TGV in france runs to a lot of smaller locales. I would think we could support one from San Diego-LA-San Francisco and perhaps NYC - Buffalo - Cleveland - Chicago.
Houston - San Antonio - Austin - Dallas, perhaps.
In the end, it will require some level of government subsidy - but any other transportation model will require those subsidies as well. Maintaining and adding highways costs a lot of federal dollars.
The texas one I could seem but the Buffalo Cleveland Chicago area is losing population as we speak.
This is something that has to be done first as an experiment, in an optimum location to see if it works. The other key is that right of ways MUST be seperate from frieght lines to make the links independent of slowdowns related to frieght traffic.
That will probably require all sorts of eminent domain, and be very costly.
You know, why not use the median or sides of the interstate system? High speed rail is usually built on pillars above ground so you don't have to slow for road crossings or worry about people and animals getting to the track. The right of way already exists for interstates, double task it. As you get closer to the city, you would need to determine right of way issues for access to the terminal.
Yeah! We can put a solar panel roof over the train tracks & highway to power the trains & the cities they connect to.