Just connect DC to Atlanta with a straight line, and Dallas to Phoenix. Don't bother connecing any cities in between, what would be the point of that? Just drill tunnels through endless rock just to connect two cities!
But! You want to travel from San Diego to Phoenix? SLC to Denver? Easy! Just go in a huge circle, or "loop", if you will, three times the distance you're actually going.
Just connect DC to Atlanta with a straight line, and Dallas to Phoenix. Don't bother connecing any cities in between, what would be the point of that? Just drill tunnels through endless rock just to connect two cities!
But! You want to travel from San Diego to Phoenix? SLC to Denver? Easy! Just go in a huge circle, or "loop", if you will, three times the distance you're actually going.