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this 51? 3-3/4? rivet side mechanical reefer has an aluminum roof, reefer yellow sides and black ends, white, black and red ?The Milwaukee Road? logo and runs on black roller bearing trucks. The purpose of a mechanical reefer is to keep perishable items cold. Early reefers were of all wood construction and used ice for cooling. By the 1940?s, new reefers were being built entirely of steel. Insulating techniques improved to the point where economical refrigeration could be accomplished using steel side plates in place of wood sheathing.