Note that while I'm sure Shanghai has a nice subway, that Wikipedia list is pretty crap. Not that the information in it is actually false (I haven't checked),

Note that while I'm sure Shanghai has a nice subway, that Wikipedia list is pretty crap. Not that the information in it is actually false (I haven't checked), but rather that the criteria for entry seems to be fairly meaningless/arbitrary. In particular, it seems to (1) only count a single organization for each city (how chosen, I don't know), and (2) use some unknown, and apparently inconsistent, definition of "metro," which doesn't even seem to match the page's discussion of that topic. So rather than something useful, like "amount of metro-like rapid-transit in each city," it's really more like "largest organization running something metro-like in each city, with the definition of 'metro-like' varying widely between cities." >< [This especially affects Japanese cities with their tendency towards having many private urban railways (although well-integrated operationally) in each city, rather than single city-wide entities.]