It should be clear, btw, that "train" here does not necessarily mean "uses two steel rails." The tech can vary as long as the form is right.
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Replying to @380kmh
The crucial thing is that cars, buses, etc, have one capacity multiplier (seats); trains have two (seats per carriage + # of carriages)
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Replying to @380kmh
So, trains can manage the best throughput per lane, a station with 10 tracks can handle FAR more people in an hour than a highway w 10 lanes
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Replying to @380kmh
So, why all this emphasis on commercial space and throughput? Futurism!
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Replying to @380kmh
Technological development is a process which occurs in active & growing cities--Jacobs writes about this in "Economy of Cities."
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Replying to @380kmh
The ability of a city to keep growing is vitalpic.twitter.com/U7zzvwHTUI
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Replying to @380kmh
So, cities need to grow--which means they need to be able to handle greater and greater concentrations of commercial activity.
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Replying to @380kmh
IF--big if--the only limits to human development are ingenuity, then I think "3 dimensional" commercial space will be more common in future.
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Replying to @380kmh
Currently, development of this intensity only exists where the transportation tech allows it to: at a handful of VERY busy stations in Japan
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Evolutionary advantage prob looks like cheating to those bound for extinction huh
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Replying to @SpaceNorman @PunishedSnek
story's more complicated than any one cause but every little thing counted
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