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A boxcar is a North American railroad car that is enclosed and generally used to carry general freight. The boxcar, while not the simplest freight car design, is probably the most versatile, since it can carry most loads. Boxcars have side doors of varying size and operation, and some include end doors and adjustable bulkheads to load very large items. Similar covered freight cars outside North America are covered goods wagons and, depending on the region, are called "goods van" (UK), "louvre van" (Australia), "covered wagon" (UIC and UK) or just "van" (UIC and UK). == Use== Boxcars can carry most kinds of freight. Originally they were hand-loaded, but in more recent years mechanical assistance such as forklifts have been used to load and empty them faster. Their generalized design is still slower to load and unload than specialized designs of car, and this partially explains the decline in boxcar numbers since World War II. The other cause for this decline is the dramatic shift of waterborne cargo transport to container shipping. Effectively a boxcar without the wheels and chassis, a container is designed to be amenable to Intermodal freight transport, whether by container ships, trucks or trains, and can be delivered door-to-door. Even loose loads such as coal, grain and ore can be carried in a boxcar with boards over the side door openings. Later grain transport would use metal reinforced cardboard which was nailed over the door and could be punctured by a grain auger for unloading. This was more common in earlier days; it was susceptible to losing much loading during the journey, and damaged the boxcar. It was also impossible to mechanically load and unload. Grain can also be transported in boxcars designed specifically for that purpose; specialized equipment and procedures are required to load and unload the cars. However grain is better transported in covered hopper cars. Livestock can be transported in a boxcar (which was standard practice in the U.S. until the mid-1880s), but there is insufficient ventilation in warm weather. Specially-built stock cars or converted boxcars are preferable. Insulated boxcars are used for certain types of perishable loads that do not require the precise temperature control provided by a refrigerator car. Circuses used boxcars to transport their workers, supplies, and animals to get from town to town. Box cars were used for bulk commodities such as coal, particularly in the Midwestern United States in the early 20th century. This use was sufficiently widespread that several companies developed competing box-car loaders to automate coal loading. By 1905, 350 to 400 such machines were in use, mostly at Midwestern coal mines.〔William L. Affelder, Box-Car Loaders, (Mines and Minerals ), Vol. XXV, No. 8 (March, 1905); pages 372-377.〕 Historically automobiles were carried in boxcars, but during the 1960s specially built autoracks took over; these carried more cars in the same space and were easier to load and unload. The automotive parts business, however, has always been a big user of the boxcar, and larger capacity "high cube" cars evolved in the 1960s to meet the auto parts industry's needs. Special boxcars carry newsprint paper and other damage-sensitive cargo. While not holding the dominant position in the world of rail borne freight that they had before World War II, the boxcar still exists and is used in great numbers around the world. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boxcar」の詳細全文を読む スポンサード リンク
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