Most of the US lives east of the Mississippi River, where population density is commensurate with Europe. No one seriously proposes HSR from SF to Boston, but H

Most of the US lives east of the Mississippi River, where population density is commensurate with Europe. No one seriously proposes HSR from SF to Boston, but HSR from, say, Chicago to NYC is within the bounds of viability. And it's frankly criminal that we don't have 4h travel times from Boston to DC. As I've said in the past, the only cities of the 50 largest in the US that are unquestionably out of HSR range are Denver and Salt Lake City, with Memphis, Birmingham, and Oklahoma City on the fringes of viability (from most to least viable). The other 45 cities? Totally viable.