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History Channel showed the Panama Canal Lock concrete arriving on flats from a gang of mixers. The Hoover Dam mixers were located at the now visitors center parking structure and a short rail carried the buckets to the landings for the overhead wire cranes. The Hoover Dam cement was delivered in converted boxcars and vacuumed into silos above the mixers. Aggregate for the dam came from Arizona. It was hauled to the mixer plants by rail. Many of the coastal defense sites had small or narrow gauge railways for excavation and concrete movement. Later they had rail sidings for the guns and still later the ammunition. Since the 1930s, rubber tires have replaced the rails as afavorite transport mode. <br />See the Yahoo Cajon Group for Victorville, CA cement plant information. Also there is a flag just east of Colton on what's left of a limestone hill. The plant is south; I think this is the Riverside Cement plant. <br />Have fun, Lindsay
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