Don’t forget the slight problem caused by the ever-expanding, volcanic Mid-Atlantic Trench. It’s a huge rift where two continental plates are being forced apart by uprising lava. Not a place I’d choose to run a rail line through.
That’s not altogether true. I’m told the trains between L.A. and San Diego turn a profit; they certainly seem crowded enough to. That line also goes north to San Luis Obispo, though I believe less frequent, less crowded, and perhaps not profitably.
With the state of air travel the way it is, I don’t see why we wouldn’t want a high speed train between L.A. and the Bay Area.