"subway standards" refers as much to vehicle type and infrastructure as it does to scheduling, it's a *very* big project but long overdue and the need won't exactly diminish over time
Japan has short-haul subway lines with no commuter rail through service, as well as short-haul subway lines with through service onto commuter rail, as well as commuter rail without subway through service.
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Their commuter lines have short-haul and long-haul services, intercity trunk lines offer short- and long-haul commuter services as well, etc etc
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We certainly see that in Britain, it's hard to tell where commuter becomes intercity sometimes. Especially now BR has gone.
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Yes! And given enough time, the difference will blur further, converging on the same form in urban areas.
End of conversation
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The through service is the difference. Actually I was being slightly unfair to London: apart from the Met, the Bakerloo does run on the Watford DC line and the District on the line to Richmond. But these aren't like the Japanese ones.
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But it's a difference that only came about by historical accident, and even then only partially (as you've described, there *are* through services in London, just very little integration between suburban and urban lines).
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Paris is more clearly segregated. But you usually don't want 300 metre commuter trains on the same tracks as 130 metre subway trains
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Correction: you *can't* have them on the same platform. If they were of a compatible length, why wouldn't you want them to? Moreover, why should they be of such radically different lengths in the first place?
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Mainly the cost of building, and especially extending, underground stations. And the time taken to clear stations and points.
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I'm not sure you read my tweet: *if they were of compatible length,* why wouldn't you want them to use the same tracks? And, following on that, what advantage is conferred to the riders by having them of such different lengths in the first place?
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Bear in mind that if you want to double capacity on a line, you can either double the size of the trains, or double the frequency: the latter option has the extra benefit of shortening wait times for riders and increasing the number of possible trips in a day.
End of conversation
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