Oh, Amtrak is still around, just with fewer routes. The Denver/Portland route went away about fifteen years ago. However, as part of the Inflation Reduction Act, Amtrak is getting some routes restored, which I look forward to.
As for airports, DIA is truly gigantic, with six enormous concourses, all radiating from a rattly and jerky central subway. United changed the gate THREE TIMES on the trip to Seattle, all on very short notice. By the time I got my seat on the 100% full 737, I must have walked two miles, with no place to sit and rest, just a nonstop slog the whole way. Although I felt sorry for myself, I felt more sorry for the exhausted single moms carrying infants.
This is gross violation of the ADA act. There are old people (me), folks on crutches, and single moms force-marched to distant gates through an immense facility with nowhere to sit.
I think it’s absurd the wealthiest country on Earth has only two modes of transportation, with the airlines steadily degrading service year after year, and the Interstate Highway System no better than it was in the Seventies. Of course, if you are uber-rich, you just take your limo to the private-jet-only airport and stroll out of the limo straight onto the private jet a few feet away.