There are spots where it's much brighter - for example, between Boston and Washington, DC, there is quite a bit of rail service, with departures frequently from each endpoint and cities in between (Baltimore, Philadelphia, New York, etc.). It's higher speed than most passenger rail in the country, but not "high speed" in the sense of Europe or Japan.
I've gone from Baltimore to Philly that way a few times, and it's pretty nice...and it's busy.
A private company recently introduced service in Florida with semi-high speed trains that runs from Miami to Orlando. That seems to be pretty popular as well. And some cities (New York and Chicago, for example) have an extensive network of commuter rail.