Plains Depot One of the best-known former rail stations in Georgia is the old Seaboard Air Line depot in Plains, Georgia. The 1890 building, which served as Jimmy Carter's presidential campaign headquarters, is now a museum with self-guided exhibits on his campaign. Trackside. From: Historic American Buildings Survey. More photos, drawings, and data online at Library of Congress, Prints and Photographs Division here. Trackside, measured drawing. From: Historic American Buildings Survey. More photos, drawings, and data online at Library of Congress, Prints and Photographs Division here. Plains depot history by Historic American Buildings Survey, National Park Service. Plains (pop. 764) is in western Sumter County in southwest Georgia. RailGa.com. Georgia's Railroad History & Heritage. © Steve Storey Railroad History | The Depot List | Locomotives On Display | Odds & Ends | Sources & References | Home