These Southern Pacific class F-70-2, 50' flat cars were built in early 1941 by the Sacramento General Shops. The 70-ton cars in series 79700-79824 carry a military load representing the M26 "Dragon Wagon" and M15 40-ton trailer. The "Dragon Wagon" was a tank recovery vehicle designed by Knuckey Truck Company, manufactured by Pacific Car & Foundry Co., and was in service from 1941 to 1955.