alt Hacker NewsJapan is a fairly unique case, and probably does not share much with China aside from being in the same region. Japan is geographically well suited to serving a large portion of the population with one long line with a few branches. That's a convenient advantage.
China just doesn't have to worry about environmentalists or anyone else locally trying to stand in the way, they just bulldoze them and build.
China also has much lower labor costs, and even Japan is a good bit cheaper (than the US, at the least)
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dgacmu • last Tuesday at 11:40 PM
Yes, but also:
The metro area density of Tokyo is 3,000 / km^2
The metro area density of Beijing is 1,747 / km^2
Greater Los Angeles: 208 / km^2
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> Japan is geographically well-suited
Most of the rail has get around mountainous, uneven terrain subject to earthquakes, strong winds, and heavy rain. California should be able to build rail parallel to the I-5, a long, flat terrain without extreme weather or strong earthquakes. The problem seems to be a political one, not an engineering one. In fact, if the Interstate Highway System did not already exist, I doubt the U.S. today would be able to accept and complete it.
> one long line with a few branches
I currently live in Japan, and that does not really match what I've observed. There are three distinct railway companies in my area (JR, Tokyu, Yokohama Municipal Subway), each with their own dedicated rail, trains, power supply, etc.
The situation is more like "a disjoint union of graphs, where some of the graphs are connected".