A refrigerator freight car, circa 1870.
flipFlip to A Bergner and Engel Brewing Company refrigerator railroad car, circa 1880.
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A refrigerator rail road car, with the inside viewable.

Credit: Courtesy of Larry Handy,

Easily identifiable by their telltale roof hatches, "ice reefers" seemed to improve every year as they underwent constant redesign. Relying on the fundamental principle that warm air rises and cold air sinks, loads were either hung, stacked, or raised on pallets, so the cool air would always circulate around the load.

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