Rail cars have been used to transport livestock since the 1830s. The first shipments in the United States were made via the Baltimore and Ohio Railroad in general purpose, open-topped cars with semi-open sides. Thereafter, and until 1860, the majority of shipments were made in conventional boxcars that had been fitted with open-structured iron-barred doors for ventilation. A traditional stock car resembles a boxcar with louvered instead of solid car sides for the purpose of providing ventilation; stock cars can be single-level for large animals such as cattle or horses, or they can have two or three levels for smaller animals such as sheep, pigs, and poultry.

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