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Originally Posted by hipster duck
HSR is just not a good economic investment except in very few places where gigantic, centralized cities with congestion problems and huge volumes of intercity traffic are located somewhat close to one another. Even in Europe, HSR construction has slowed considerably compared to 10 years ago. China is still building lines, but not at the fever pitch of a decade ago.
It’s just a lot of money to spend for quite incremental gains. The technical demands of the infrastructure is like building a metro system - except over hundreds of miles.
Unless you have an existing passenger rail corridor that is maxed out for capacity, the money will be better spent increasing the frequencies and reliability than spending tens of billions of dollars to save twenty minutes of travel time.
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The US has so little intercity rail infrastructure that everything would need to be built new. It would be pointless to throw money at privately owned freight railroads to speed up the twice weekly train they allow on a freight line whose route isn’t relevant to passenger travel.
In Europe and Asia, investment has slowed because those networks are now mature. Upgraded networks make more sense.
There is no reason to build a brand new slow conventional railway in the US when it costs about the same due to land acquisition and construction.
Regarding Chicago to Milwaukee, an upgrade to the line was recently cancelled. NIMBYs and private freight line owners did it in. It will never be more than an inconvenient slow line with only a few daily trains. The only option to create useful rail between the two is with a whole new line. Which might as well be HSR.