Yeah, I think you could make an argument that NOL is a hub station, since trains in 3 directions do serve it as of now. And of course whenever the Gulf Coast Limited to Mobile restarts again in the next few years, that it'll become 4. Too bad that to transfer between trains there, that essentially you have to overnight in NOL to transfer between trains. And of course it sucks too, that Sunset Limited still only runs 3 days a week.
I do hope that one day, maybe Denver could at least get up to the level of being a partial hub, the way Seattle, Portland, Kansas City, and Saint Louis are? Meaning that for the former 2 that they serve the Coast Starlight, one of the 2 branches of Empire Builder, and of course Cascades trains. Washington state DOT(WSDOT) was proposing one day for state train service to run from Seattle-Auburn-Yakima-Pasco-Spokane(dunno if I forgot any stops, the proposal I read at least does go through these places on a Washington state train route map I read w/that Auburn/Yakima/etc proposal), which I think would be a nice idea. KC and STL do serve Missouri River Runner state trains, besides the Southwest Chief and Texas Eagle respectively for those 2 cities. Would be nice if the La Junta-Denver through train service idea, where a coach car and a sleeper car, could be added/removed from the train in Denver could be done. Along with for Kansas City(and Chicago too), that a through car could be added/removed from the Southwest Chief in Newton, KS for an extended Heartland Flyer train route north from OKC. Now that I think about it Fort Worth could potentially also become a partial hub, considering it gets the Heartland Flyer, Texas Eagle, has local commuter rail service, and that maybe someday train service could be revived between Fort Worth and Denver? And one last thing for Saint Louis, you also can pick up Metrolink(light rail for the St. Louis area) trains at a station immediately outside of the St. Louis Amtrak station, along with also local city bus routes.