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To me the main issue with AMTRAK is its insistence on being for long-distance travel when that's really not practical, people only travel long distance a couple times a year. I think they should focus more on going town-to-town aiming to serve people just commuting an hour or so by car. As such I think the best case would be to create a series of systems to serve the main economic hubs locally with a couple connections between the main systems in case you really do want to ride the train cross country. This way there's a reason for people to ride trains at least almost daily. This is why the DC to Boston corridor is the only really lucrative lines, because people really do travel from suburban satellite towns to other towns and cities regularly. This map probably isn't perfect but these tend to be the main economically tied groups in the US. With small services around the Anchorage Alaska area and maybe in O'ahu island Hawaii.