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Having said that, do I think there should be a train linking every population centre? No. You're right that mass transit only makes sense for routes where it is (or likely will be) common for a large number of people to travel. There are journeys where trains can't replace buses, private vehicles and active transport.

But based on what I saw in China, I think they can and should replace most (if not all) domestic air travel.

(5/?)

@sj_zero
@fgraver @AccordionBruce @tbaldauf