[zdragnar]

You said:

> In my home country I could go anywhere in a 50km radius for 50$/month via public transportation.

> Anywhere in the country via high speed train for 100$/month.

That literally isn't feasible to do with a low impact unless your definition of "anywhere" is a handful of major cities, especially since cars aren't going away.

New York City has a population density of 27,000 people per square mile. Statewide is 420, though NYC metro brings that up. Austin is 3,000.

If you want "anywhere", you also need to think about places like Montana, with a population density of less than 7 people per square mile.

Trains make sense for metro areas, not rural areas, and there is a lot of rural area to cover.