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That makes sense on some corridors but I'm not sure about the economics of building 2000 miles of dedicated right of way for a train that runs 3 times a week. Maybe if price, reliability, and speed of the service improved to such a degree it could feasibly compete with air and highway travel between those cities.

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The good news is that most of the population lives in corridors that would make sense.

The I-5 coast and everything west of I-35 represents most of the US population. In particular, Chicago, Atlanta, and New York form a triangle roughly 700 miles on each side. This is roughly the distance between Beijing and Shanghai, or Tokyo to Fukuoka, both of which see high speed trains regularly making the full journey.

Chicken and egg. Running 3 times a week slowly and expensively isn't going to increase ridership.

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