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Also see:
- https://bernardgreenberg.com/Subway/
- https://github.com/BernardGreenberg/NXSYS
- and the incredible pages on the nycsubway.org site such as https://www.nycsubway.org/wiki/Subway_Signals:_A_Complete_Gu...
- https://bernardgreenberg.com/Subway/
- https://github.com/BernardGreenberg/NXSYS
- and the incredible pages on the nycsubway.org site such as https://www.nycsubway.org/wiki/Subway_Signals:_A_Complete_Gu...