The distance from between NYC and Florida is about 900 miles (not an especially satisfying drive when you throw in Florida’s length), Salt Lake to San Francisco 600 miles, Denver to Chicago 900 miles, Detroit to D.C. 700 miles so you can see the benefits. One reoccurring idea from soccer moms traveling is to; piggy-back on flat bed rail cars, like ferry. The high-speed train could streak across the region and then you simply drive off. In studying this concept which seems more than relevant could be done by modifying the TTX Auto Hauler Trailers design for high-speed rail and put in a couple of portable toilets houston so you could get out and use the restroom.
Then you have your car when you get there. Trains with no engineers are here and this is one way we can take out human error and reduce costs. Perhaps with the strong union controls in New Jersey, Michigan, New York, Ohio, Massachusetts, Connecticut. Maryland and D.C. it may not be feasible in this decade, but surely for cargo transport trains it could be done. Eventually these new technologies could be introduced and we can enjoy the economies of scale needed to vastly improve our current flow of transportation. Think about it.