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I think it'll be easier/cheaper to figure out how to economically manufacture carbon-neutral kerosene from renewable energy sources (rather than digging it up out of the ground) and just fly normal airplanes, than it will be to build that mammoth HSR route. And the journey will be much faster too.

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The point of such a road is not to traverse it from one end to the other, it's to be able to get on and off it anywhere along its length. It also has symbolic meaning.

No one spends billions for the sake of symbolism.

Not solely for it, sure. But I didn't say it was solely for symbolism either.

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