Well, could it be that the entirety of France fits inside the state of Texas? A 300 mph train running the 2800 miles from LA to NYC would take a minimum of roughly 10 hours to make the trip non-stop. Of course, crossing the Pacific coastal range, then the Rocky Mountains, then the Appalachians, on top of making at least some stops along the way, and definitely not being able to make 300 mph continuously, would make the trip more like 3 or 4 days in length. The cost would be equal to or much higher-- likely much higher--than air travel.
Given those figures, NOBODY would take the train when they can fly. Four or five hours in the air and you're there is preferable to an interminable trip on a choo choo train. That's why passenger train service died out in the US decades ago. China is losing their ass in money on their high-speed rail system. It is unsustainable.
Why take a train from LA to Vegas when a flight takes one hour with similar wait times at both ends compared to using high-speed rail. Spending a whole day, effectively, on a train to get to Vegas makes ZERO sense for say, someone going there for a three-day weekend. Flying lets you spend three days in Vegas versus say maybe--MAYBE--two if you take the train.
California's high speed rail program has already exceeded $100 billion and it hasn't moved a single passenger. That's somewhere between 3 and 4 times the original estimate, and my bet is that's only a fraction of the real cost. In fact, the $100 billion estimate moved to $105 billion this year.
Japan is roughly the same size as California. Again, high speed rail for the entire US is absurd. China has spent nearly a trillion dollars on their system, and it isn't making a cent of profit.
High speed rail makes ZERO sense for America.