So you're saying you have like 30 with populations at or over 100k? Ok. Wow. The US has over 330 like that. A rail system doesn't sustain when people are trying to get from one place to so many different destinations and you can't claim it can, when it's literally never been created on a scale of anything similar to the US. For everyone to get to their destinations without it taking many extra hours of travel time you'd have to have a massive amount of trains and track, and tons of them would be going places where they may only have a handful of passengers on board, and a train running with just a dozen passengers is a hell of a lot worse for the environment than a dozen cars. A lot worse. Trains are only efficient if they're closer to full. That can't happen in the US unless travel destinations limit themselves way down, which cuts a lot of people off from using them.