Explain how the railroad played a key role in the development of the s

Explain how the railroad played a key role in the development of the steel, oil, and meatpacking industries in late nineteenth-century America.

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ANSWER
Railroads delivered raw materials to manufacturing centers and finished goods to distant and enlarged markets. Railroads were major consumers of steel, petroleum, and timber. Railroads also pioneered consolidation and managerial techniques later used in other industries.