Actually the US has the worlds most efficient train system: https://www.masterresource.org/railroads/us-most-advanced-ra...
For long hauls, we use our RRs to move freight and airlines to move people. By traveling at 600mph instead of 60mph (the speed of most European train travel - intercity high speed rail is rare and expensive) I can get to anyplace in the continental US in under 5 hours from my home in Austin.