[DiogenesKynikos]

The cutting edge for high-speed rail around the world is 350 km/h, with the fastest lines having average speeds (taking stops into account) of about 275 km/h. At those speeds, it would take:

  * DC to NYC: 80 minutes.
  * NYC to Boston: 80 minutes.
  * NYC to Toronto: 2 hours and 45 minutes.
  * NYC to Chicago: 4 hours and 35 minutes.

That would put a massive dent in air travel. One can only dream, I guess.