Between the benighted rule of the teamsters and the future domination by efficient pipelines, there arose an interregnum in which the railroads exercised pervasive influence over everything that happened in the industry. At first, they tried to ship barrels on open flatcars, but the swaying, jolting ride splintered the containers and spilled their contents. After the Civil War, this hazardous method was superseded by primitive tank cars—twin pine tubs mounted on flatcars—that were soon replaced, in turn, by single iron tanks that became the industry norm. Such technical advances allowed the
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