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Originally Posted by volguus zildrohar

New York is in rare company I suppose here - I can't think of a single extensive heavy rail rapid transit system that doesn't at least service streetcar suburbs, even in the US. Chicago, D.C., Boston, Atlanta, San Francisco - even Philadelphia - all have subways that go to the suburbs, but not New York. Interesting that all that iron stays in town.

Probably because outside the downtown core of other cities it would be considered suburban but most of NYC is pre-war dense within it's city limits.