When I moved here in 1976 I was dating a woman who lived on Russian Hill and after being fortunate enough to spend the night with her I would take the cable car to my job near Union Square. I usually hung out on the back deck with the conductor and smoked cigarettes.
When I spent the night at home in Noe Valley I took the J Church streetcar to work:
All of MUNI, the cable cars, the streetcars, and the buses cost 25 cents and came with a free transfer that was good for 2 ½ hours.
In a wide variety of livery, here is a small bit of the MUNI fleet in the 1970s:
Source: David Pirmann Flickr