Local solar time
Before standardized zones, communities commonly set clocks according to local solar time. Noon in one town could differ by several minutes from noon in another.
The scheduling problem
That variation became increasingly difficult as rail networks expanded. Timetables involving many towns required a more consistent system for employees and passengers.
Railroad Standard Time
In 1883, major North American railroads adopted a system of standard time zones. The change was driven by operational practicality and was widely adopted by communities.
Federal standardization
The United States later established standard time in federal law. The railroad industry's earlier adoption demonstrated how transportation technology could push society toward shared national standards.
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