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Great site. I don't know how difficult it would be to implement or whether it would hurt the performance, but it would be great if you overlaid the subway lines. See http://www.onnyturf.com/subway/ for an example.

Frankly, I don't know why google hasn't done this themselves, it's incredibly useful.

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Good idea - it would slow it down a bit, but I'm pretty sure it would be useful. The subway commute-time filter is a bit limited in its use, but you can use it to try areas for their commute time to other areas.

Also, it's not as useful, but if you zoom in on the metro stations on any google map, it'll tell you what lines stop there.

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