The homes that the SN served in 1939 were evacuated by the mid-1960s as the Navy took over Port Chicago and created the two-mile safety zone. As the Navy continued to build up armaments in this area, General Chemical flourished as did new industries along the SN’s right-of-way. Sources of USDA aerials: 1939, Google Earth; 1958, BUU-6V-41, 8/13/58, Contra Costa County Historical Society; 1965, the National Archives of San Francisco, RG 77 NRHS Acc Number 077-99-01 Box 9, Folder 6; 1968, 3-214 GS-VBZJ, 4/22/68, Contra Costa County Historical Society
L171-15-US Dept. of Agricuture, AAA Western Division Aerials,
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