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<p>operators and shippers. Since they often carry only one commodity, cars are of all the same type; often identical. Some commodities (e.g., coal) can be loaded at the origin while the train moves slowly on a loop track. The procedure is reversed at the receiving end, and because there generally is not any commodity to be hauled in the opposite direction, the train returns empty. In the <a href="page.php?w=United_States">United States</a> the <a href="page.php?w=Atchison%2C_Topeka_%26_Santa_Fe">Santa Fe</a> is credited with operating the first</p><p>
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