The RER concept is pretty much the same concept
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.
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