Compare rail density in Tokyo with Beijing, Shanghai, Hong Kong (scale is slightly off on HK). Only subways are colored--not regional railpic.twitter.com/k3oF8tP0Us
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...you can also see Paris's rail network is about as dense as Tokyo's, tho less of their regional rail is held to subway standards afaik
NY's map is a bit of a cheat. They use interlining a lot, as well as counting express and local services as separate.
This map doesn't show duplicate lines for express and local services--it treats all lines of the same "color" as one line
If you remove the reduplication it'd be less dense
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