At the end of the Civil War, what communications system did the railroads use to coordinate their complex flow of rail cars?

Name: At the end of the Civil War, what communications system did the railroads use to coordinate their complex flow of rail cars?
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The magnetic telegraph was used by railroads at the end of the Civil War to coordinate the complex flow of rail cars, as it allowed for instant communication over long distances, which was essential for managing the logistics of rail transport.

At the End of the Civil War, What Communications System