Cool. I know you're big into transit so I'd be especially interested to see which cities you would think would fit best. I've got kind of a vision of a 3-tier rail system. A bunch of primary, secondary, and tertiary cities. 10-15 primary cities would have direct lines to each other at maximum speed. Secondary cities would have a slightly slower speed and connect large cities to the primary cities. Then tertiary lines would connect primary and/or secondary cities to tertiary cities, including state capitals (if they aren't counted in the previous 2 groups.) Also, because lol metastasis_d loves Texas, Dallas, Houston, and Austin would all be primary cities. Here's my rough draft. Note I also included Canada. Considering adding Mexico.