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It does seems logical to start with the most populated areas and work out from there. Which explains your observations about the correlations between high population density and train corridors. But so does the fact that causation goes in the other direction too. A small town on a new or upgraded train line between two major centres can become a much more attractive place to live, when some of the trains stop there. Plane links can't do this.

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@sj_zero @fgraver @AccordionBruce @tbaldauf