> Where in the US can one find the secret, cross-country high-speed rail built in the roaring twenties?!

Nowhere because the USA has an excellent internal flight and interstate highway system instead. Railways were already becoming uncompetitive by the 1920s and now live on mostly in parts of the world where they already exist, where land is at a premium.

The reason people think China will crash is that their system isn't unique, has been tried many times before and eventually always fails. That isn't circular reasoning, it's reasoning based on prior experience. China is still a communist country: we know how that story ends and why. Remember that for much of the history of the USSR people in the west were dazzled by its rapid industrialization and apparent achievements. First country to put a man in space! Many people in that era genuinely wondered if central planning was just a superior way to do things. In hindsight we can say that it wasn't: with enormous focus such economies were able to pull off heavy engineering projects at scale, but at the cost of ignoring consumer goods and with a dysfunctional economy that was brittle to its core.

End result: when Yeltsin visited NASA in the 1980s he demanded a surprise inspection of a local supermarket. NASA didn't impress him, but the 30,000+ products for sale in a mundane shop blew him away. He was shaken to his core and cried on the flight home, asking himself what they had done to Russia's poor people. The USSR collapsed just a few years later, Yeltsin became president and moved Russia in the direction of a market economy.

Yeltsin was trying to reform the Soviet system. He was a party higher up, surely he knew what he’d find in a supermarket. He’d had a long political career by the. My guy says the supermarket tour was “staged” in the sense that he knew what he was going to find and he knew what reaction would be politically helpful for his project.

This isn’t to say the Soviet Union was, like, a good pleasant place to live. But we shouldn’t accept Soviet propaganda just because it happens to align with our priors.

> Nowhere because the USA has an excellent internal flight and interstate highway system instead

Both being impossible to decouple from fossil fuels consumption at current scale, essentially.

> End result: when Yeltsin visited NASA in the 1980s he demanded a surprise inspection of a local supermarket. NASA didn't impress him, but the 30,000+ products for sale in a mundane shop blew him away

I have no idea whether this anecdote is true, but it wouldn't be surprise me one bit for an always-drank dude who made the army shell the parliament of his own country.

> Nowhere because the USA has an excellent internal flight and interstate highway system instead. Railways were already becoming uncompetitive by the 1920s and now live on mostly in parts of the world where they already exist, where land is at a premium.

The fact that railways were becoming uncompetitive in the mid-1900s is why high-speed rail was developed. The Japanese pioneered high-speed rail in the 1960s, dramatically increasing the speed that passenger trains could run. That not only made trains competitive again, but hands-down the best mode of transportation for distances of a few hundred kilometers. The result is that new high-speed rail networks are being built around the world, not just in places where rail is already prominent.

In places where high-speed rail exists, it has taken most of the market share away from short-haul flights. If you want to get from Paris to Brussels (300 km), or from Beijing to Shanghai (1200 km), you take the train. This is despite the fact that Western Europe and China have excellent highway networks (China's highway network is now superior to the US interstate system) and plenty of airports.

> China is still a communist country: we know how that story ends and why.

China is not at all like the USSR.

> NASA didn't impress him, but the 30,000+ products for sale in a mundane shop blew him away.

China has an absolutely crazy abundance of consumer products. These days, Americans turn to Ali Express to get random widgets or knick-knacks of any kind. China is the place where you can pull out your smartphone, order pretty much anything, and have it arrive by courier 15 minutes later (okay, that's a slight exaggeration, but not much of one).