nfitz
Superstar
I've seen full-fledged subway lines in many cities with frequencies less than every 5 minutes peak!Let me toss another definition into the discussion:
Subway - Anything with frequency better than every 5 minutes.
Would trains like the New York Subway 6 train (or am I thinking 4) (for example) qualify then? I haven't measured, but I think there might be more it it that is elevated, than underground.Using frequency is an interesting metric. However, I still think that the definition for a subway should be "a completely grade-separated rail-based transit line that runs primarily underground".
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