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In page First transcontinental railroad:

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The Bessemer process and open hearth furnace steel-making were in use by 1865, but the advantages of steel rails which lasted much longer than iron rails had not yet been demonstrated.[citation needed] The rails used initially in building the railway were nearly all made of an iron flat-bottomed modified I-beam profile weighing 56 or 66 pounds per yard (27.8 or 32.7 kg/m).[citation needed] The railroad companies were intent on completing the project as rapidly as possible at a minimum cost. Within a few years, nearly all railroads converted to steel rails.[citation needed]