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I conclude from reading the OP that what is called "high speed rail" may not be worth the effort is a country populated the way the US is. The problems of going over about 180 mph don't seem to be worth the expense and effort. But 180 mph trains between relatively close cities (300 t0 500 miles apart) would have been welcome when I was traveling all the time.
A question:
Do those 400 mph trains use the wheels for braking or do they have some kind of brake shoe that drops down and contacts the track?
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