Thanks. I've never seen before a map of the other proposed corridors.
There are some projects piggybacked on. For example, the route across Georgia and Alabama from the port of Savannah to I-59 which runs down to the port of New Orleans to provide some additional pork, and note the concentration of port in North Alabama-North Mississippi, but the backbone are Mexico-Canada routes. (Also note the plan for developing a Pacific port for Texas so the west coast can be written off to disaster, natural or otherwise, while maintaining a transportation corridor to the heartland.)