A good rail network would be a huge asset to almost everyone in the US, but it wouldn't look much like the networks you see on visionary maps like this. Mostly it'd be even more clustered around the east and west coasts, New York, California, and Chicago, with fewer coast to coast passenger lines, because the US's population is highly concentrated in those places. The center of the country would benefit more from a better freight rail network, so they can more efficiently/greenly export crops and import stuff from the ports.
A good rail network would be a huge asset to almost everyone in the US, but it wouldn't look much like the networks you see on visionary maps like this. Mostly it'd be even more clustered around the east and west coasts, New York, California, and Chicago, with fewer coast to coast passenger lines, because the US's population is highly concentrated in those places. The center of the country would benefit more from a better freight rail network, so they can more efficiently/greenly export crops and import stuff from the ports.