What we now know as standard time, with the continental U.S. divided into four zones, originally was called

Name: What we now know as standard time, with the continental U.S. divided into four zones, originally was called
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The concept of dividing the continental U.S. into time zones was originally developed by the railroad industry to create a standardized time system for scheduling trains, hence it was called "railroad time."

What We Now Know as Standard Time, with the Continental