Muni runs a sharp operation and covers the city pretty well. It also has the advantage of being geographically compact with a rather high population density throughout its operating area.
Large photo archive. Link at bottom of page
https://www.sfmta.com/about-sfmta/our-history-and-fleet/muni-history
I tried to sell my two cents worth, but no one would give me a plug nickel for it.
I don't have a leg to stand on.
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