May 15, 1932 was perhaps the peak of San Francisco’s streetcar era. True, a few unimportant lines had been abandoned in the previous few years, but on this day, San Francisco celebrated a brand-new streetcar line: Market Street Railway’s 31-Balboa. It would be the such line with substantial new trackage until the F-line opened along the Embarcadero to Fisherman’s Wharf 68 years later.
