Quote:
Originally Posted by sbarn
NYC has more elevated track than people realize - approximately 40% of the system or 168 miles of track are above ground, mostly in the outer boroughs.
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True, but much of that isn't elevated.
Something like 40% of the system is non-subway, but that includes trenches (such as the N in Brooklyn and 5 in Bronx), embankments (the Q in Brooklyn, the A in furthest Queens) and elevateds. I would guess no more than 15-20% of the system sits on elevated structures. There are a lot of London-style trenches further out.