1932
Height of rail transit service in San Francisco, with more than 50 streetcar lines and seven cable car lines
1933
Last streetcar to be built in San Francisco by Market Street Railway Company workers (car No. 994) completed at site of today's Muni Green Division
Coit Tower completed
1934
Market Street Railway Company employees unionize; company wins ruling to operate cars with single-person crew; 18 lines converted to this standard
Alcatraz becomes federal prison
General strike cripples city
1935
Market Street Railway Company converts 33-line across Twin Peaks to first trolley bus line in San Francisco
Pan Am inaugurates China Clipper air passenger service between San Francisco and Hawaii
1936
Bay Bridge opens to motor vehicles
Revolutionary PCC streetcar enters service in Pittsburgh and Brooklyn; designed to compete with automobiles and buses, ultimately 33 cities will use what becomes the most successful US streetcar ever
1937
Golden Gate Bridge opens
1938
Market Street Railway Company ordered to return to two-person crews on all streetcars; 19-Polk is first streetcar line to be converted to buses the following year
1939
Treasure Island World's Fair
Transbay Terminal serves Bay Bridge interurban trains from as far as Chico
Ferry Building traffic rapidly diminishes
Muni buys 'Magic Carpet' streetcars, resembling PCCs
1941
Market Street Railway Company cutbacks: Castro cable line closed; couterbalance (cable-aided) streetcars on Fillmore Street Hill in Marina closed; streetcar lines serving Bayview district on Third Street abandoned, restored 65 years later as Muni's T-line
1942
Sacramento-Clay cable car line, incorporating world's first cable car route, closes
World War II gas rationing and conservation measures drive up streetcar ridership and forestall further rail–to–bus conversions
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