"Commuter rail" in Tokyo is more or less indistinguishable from subways--they employ the same kinds of trains and even offer through service from commuter to subway lines. I talk about "commuter rail" so people know what I mean, but the term I prefer is "suburban rail"
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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