The cattle car can trace their roots as far back as the beginning of the industry itself when animals first began to move by rail in the 1830s. During those early days there was no dedicated stock car as railroads simply used whatever was available to move livestock, usually early boxcars (with slats so the animals had fresh air) or open gondolas. According to Mike Schafer's book, "Freight Train Cars," it wasn't until the early 1860s that a specialized car was introduced to handle livestock (during the early to mid-19th century many of the now common railroad freight cars were developed), using a standard design that did not change dramatically for the next 120 years.
The layout was essentially a boxcar featuring a covered roof with slatted sides for proper ventilation. The car was also equipped with a sliding door to, obviously, ease the loading and unloading process (some early cars also featured a removable upper deck to allow for different types of smaller animals to be transported more efficiently together, such as pigs and sheep). During the latter half of the 19th century through the 20th century railroad stock cars changed little in appearance save for their size and construction materials. For instance, early cars could only carry around 20,000 pounds (10 tons) of livestock. However, by the early 1900s this number had increased three-fold to around 30 tons (30,000 pounds). During this time the car came equipped with its only notable feature, more hospitable living quarters for the animals with the addition of water and feed troughs.
These humane features were only added after complaints were made regarding how livestock was handled in-transit. Other interior improvements included pens to partition the animals apart from each other and reduce the possibility of trampling. As the 20th century progressed perhaps the only other notable change to the cattle car was the material with which it was built. For the first nearly 100 years of its use the railroad stock car was built mostly or entirely of wood. However, during the mid-1900s all-steel construction became the norm and wooden cars were no longer produced although they could still regularly be found in service through at least the 1970s.
Railroads began losing market share in the transport of livestock to the trucking industry rapidly following World War II. There were several factors for this: first was the simply the improvement in highways, which culminated with the Interstate system; the increased number of meatpacking plants, which reduced transit times resulting in less profit for the railroads; and the rise of the frozen food industry. As a result railroads grew increasingly disinterested in hauling animals since the profits had largely disappeared by the 1980s. Mr. Schafer also points out in his book that the process of handling livestock had become quite expensive requiring a large number of personnel and vast acreage to care for the animals as well as considerable transit time with several stops needed to feed and rest them.
One final expense issue regarded the location of the stock cars within the train, which had to be positioned directly behind the locomotives. The purpose of this was to not only give the animals the smoothest ride possible and allow for them to be quickly and easily fed, watered, and rested but also to efficiently get the cars swapped in and out of the train. To do so required additional more time and effort. By the 1980s stock cars had become predominantly a novelty as farms switched to trucks to transport their livestock as the distance to market was much shorter. Today, there may be a few holdouts but the stock car has become virtually extinct as the profit is just no longer there to move livestock by rail.
For more reading about the cattle car consider the book, Freight Train Cars, from Mike Schafer, one of the leading authors covering all corners of the railroad industry (from its history to present day operations). The book gives an excellent general history and overview on all of the common railroad freight car types and if you are interested in learning more about them, or you are simply looking to better understanding their history and development you should very much enjoy Mr. Schafer’s book. If you're interested in perhaps purchasing this book please visit the link below which will take you to ordering information through Amazon.com.