Post-Reagan America doesn't have the ability to consider projects on this scale, but of course one of the things a better rail system would allow is the transportation of million of exoskeleton-clad UN soldiers across the US, as well as moving tens of millions of anti-NAU activists and sympathizers to open-air holding facilities somewhere near Chicago.
[Note that I'm not actually telling to go out and blow up all the roads leading into your town, although of course those have military applications too]
Also posted at Dreamwidth, where there are