Eastern, Central, Mountain, and Pacific. Local times would no longer be used by the railroads.
When did Congress adopt the four standard time zones?
Though most states in the United States began to use the Pacific, Mountain, Central, and Eastern time zones by 1895, Congress did not make their use mandatory until the Standard Time Act of 1918. Today, many countries use time zones that differ from those proposed by Sir Fleming.
Initially, railroad executives attempted to solve the problem by establishing 100 different railroad time zones. Because of the many time zones, different railroad lines were sometimes on different time systems, making scheduling difficult and uncertain.
Finally, the railway executives agreed to divide the continental United States into four time zones: Eastern, Central, Mountain, and Pacific. The railroads would no longer use local times.
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