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As someone who loves trains I find this truly impressive and I wish my country cared half as much about trains as China does
China's population density in its eastern half is an order of magnitude higher than pretty much every country, which really changes the transportation calculation. It'd be impossible for them to build enough roads to effectively transport their population around the country
You don't even need that many people before cars become impractical.
You don't need many to become impractical. But you need China levels for it to become geometrically impossible.
you could force everyone to drive. itd be terrible, but that hasnt stopped cities like LA (a more population dense city) from doing what theyre doing.
LA is the second biggest city in the US and it'd be like 15th biggest in China. Los Angeles is also the 308th most dense city in the continental US, and not even on the radar internationally for density