You have a business trip and need to go from A to B by yourself? Take a train, it frees your brain and the highway for people traveling in groups or with lots of luggage.
Incidentally it also avoids moving 2 tonnes of material for no reason.
If the cities are closer than 600 km. Trains are good for movement inside a typical state, but rarely between states.
That’s about a ton per passenger.
[1]: https://www.news8000.com/news/amtraks-borealis-line-celebrat...
Care to flesh this out?
I can only find data that contradicts this:
https://railpassengers.org/happening-now/news/releases/new-p...
https://media.amtrak.com/2023/08/data-finds-overwhelming-sup...
Most places where people want trains have them (high density places).
This doesn't address OP's comments. To remind you, they mentioned "cheap, easy, high speed travel across the country". I would grant Amtrak is easy. It's not the other things though...
If the rail infrastructure was upgraded to allow for faster travel and the costs were lowered, Americans would find them more desirable—-guaranteed.