https://www.sfmta.com/projects/muni-metro-modernization
https://en.wikipedia.org/wiki/Muni_Metro
75 feet
(23 metres) https://en.wikipedia.org/wiki/Siemens_S200
https://en.wikipedia.org/wiki/Muni_Metro#Rolling_stock
https://en.wikipedia.org/wiki/Siemens_S200#Couplers
https://en.wikipedia.org/wiki/Market_Street_subway
https://en.wikipedia.org/wiki/Muni_Metro#/media/File:Muni_Metro_(2020-08).svg
https://en.wikipedia.org/wiki/Muni_Metro#Recent_expansions
https://en.wikipedia.org/wiki/Central_Subway_(San_Francisco)
https://en.wikipedia.org/wiki/Central_Subway_(San_Francisco)#Proposed_extension
https://en.wikipedia.org/wiki/Chinatown_station_(Muni_Metro)
https://en.wikipedia.org/wiki/Union_Square/Market_Street_station
https://en.wikipedia.org/wiki/Powell_Street_station
https://en.wikipedia.org/wiki/Yerba_Buena/Moscone_station
https://en.wikipedia.org/wiki/4th_and_Brannan_station
https://en.wikipedia.org/wiki/San_Francisco_4th_and_King_Street_station
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