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Re:NYC’s new digital subway map by aimor on Wednesday October 21, 2020 @04:05PM (#24851516)
Some other live subway maps:

New York City: https://map.mta.info/

Washington DC: https://gis.wmata.com/metrotrain/index.html

Chicago: https://www.transitchicago.com/traintrackermap/

Boston: https://www.mbta.com/schedules/Blue/line

I'd like to see more, but that's about all I could find from cities themselves.

Re:NYC’s new digital subway map by leonk on Thursday October 22, 2020 @07:16AM (#24856821)
Two I've found interesting... Tokyo: https://minitokyo3d.com/

India (not a subway, but the scale here makes it fascinating): https://railradar.railyatri.in/

I haven't found one for London (my hometown), but there is this interesting animation project that uses historical data to demonstrate passenger flow on the system. http://wgallia.com/#!underground

Re:NYC’s new digital subway map by lqet on Wednesday October 21, 2020 @04:12PM (#24851576)
There is https://tracker.geops.de/, which integrates most of them (though not always with realtime data).
Re:NYC’s new digital subway map by ElijahLynn on Wednesday October 21, 2020 @07:36PM (#24853477)
New York City: https://map.mta.info/ is the new live map being discussed.
Re:NYC’s new digital subway map by kuanbutts on Wednesday October 21, 2020 @05:20PM (#24852320)
fwiw I find the others (DC, Chi, BOS) easier to view/pan/explore