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In page First transcontinental railroad:

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Time was not standardized across the United States and Canada until November 18, 1883.[1] In 1865, each railroad set its own time to minimize scheduling errors.[citation needed] To communicate easily up and down the line, the railroads built telegraph lines alongside the tracks. These lines eventually superseded the original First Transcontinental Telegraph which followed much of the Mormon Trail up the North Platte River and across the very thinly populated Central Nevada Route through central Utah and Nevada. The telegraph lines along the railroad were easier to protect and maintain. Many of the original telegraph lines were abandoned as the telegraph business was consolidated with the railroad telegraph lines.[2]