Mining Railroads of California

American Borax Company: Columbia Mine and Railroad.
36in Gauge. Known as the "ABC" Railroad locally, the American Borax Co. operated a short railroad connecting their Columbia mine with a processing plant in Daggett. A portion of the line utilized shared/leased trackage from the Waterloo Mining Company and was later purchased when that company ceased operation. The mine was closed and the equipment sold in 1907. Daggett, San Bernardino County. 1900 - 1907

United States Gypsum Company.
36in Gauge. Started life as the Imperial Valley Gypsum and Oil Corporation, later owned by the Pacific Portland Cement Company. The United States Gypsum Company continues to operate the 20.5 mile line, hauling gypsum from the mine to the processing plant in Plaster City where it is transloaded to standard gauge cars on the San Diego and Imperial Valley Railroad. Plaster City, Imperial County. 1921 – Present