South Gate Assembly was a General Motors automobile plant located at 2720 Tweedy Boulevard in the Los Angeles suburb of South Gate, California.[1] It opened in 1936[2] to build B-O-P (Buick-Oldsmobile-Pontiac) cars for sale on the West Coast.[3] It was the first GM plant to build multiple car lines,[2] resulting from a Depression-spawned move to cut production costs by sharing components and manufacturing.[3] South Gate was the first of several B-O-P "branch" assembly plants (the second being the Buick-operated Linden plant), part of GM's strategy to have production facilities in major metropolitan cities.