As the owner of almost all the Erie and New York Central tank cars, Standard Oil’s position grew unassailable: At a moment’s notice, it could crush either railroad by threatening to withdraw its tank cars. It also prodded the railroads into granting favors for tank cars not enjoyed by the small refiners who shipped by barrel. For instance, railroads levied a charge for the return of empty barrels, while tank cars traveled free on the return route from the East Coast to the Midwest refineries. Tank-car clients also received the exact same leakage allowance received by barrel shippers, even
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