> the country is long and narrow
The northeast and west coast metropolitan corridors are similar, and combined have comparable populations, densities, and distances as Japan. Yet we can't even build a single high-speed line. And for all the excuses about the difficulty of building rail through developed regions, the existing rights of ways and infrastructure in both the NE and California are comparable to what everybody else has had to work with, at least in the past 50 years. The density of the NE is nothing like what you see elsewhere in the world, especially Asia, and Japan and China specifically.
It's lack of political will and ambition, period, by both the community and leadership. And excusing our inability by pointing at the hurdles, insinuating that others succeeded because they didn't face the same challenges, only perpetuates the paralysis.
The advatange they have is that all 4 of their major metropolitan areas are in a straight line across flat land. The enemy of high-speed is any diviations from flat and straigh. On he accela top speed can be maintained less then 40% of the trip.
> The density of the NE is nothing like what you see elsewhere in the world, especially Asia, and Japan and China specifically.
Yeah, I defy anyone who claims the US can't build trains "because of density" to fly to Tokyo, and actually take the Seibu Shinjuku line west from Shinjuku station. Look at those buildings built right next to the tracks, for many, many kilometers. People live in those -- if the windows opened, you could reach out and touch the laundry on the balconies that overlook the tracks [1].
Compared to that (and let's be clear: that's one average line in west Tokyo), even the Acela line in the east coast is a bad joke, density-speaking. The US doesn't build decent trains because the US is corrupt and sclerotic and run by incompetent people, not because of some mythical structural advantage in Magical Asia.
[1] I have no idea how people manage to live like that -- these trains are loud, and run basically from 4AM until 1AM every day -- but it's not lost on me that the fact that people can build houses right up next to the tracks might be the true advantage of Magical Japan.