1,5 That year, five time zones were officially adopted as the US entered World War I: the Eastern, Central, Mountain, Pacific, and Alaskan zones still in use today. 5 The federal organization in charge of railroad regulation – the Interstate Commerce Commission – was given the power to address coordination concerns in 1918. Standard time was transportation-driven and, as a result, the government coordination of time zones was handled by transportation agencies. 3 The major railroad companies as a result began to operate on a coordinated system of four time zones starting in 1883. 2 Due to this lack of time standardization, schedules on the same tracks often could not be coordinated, resulting in collisions. 2 With the proliferation of railroads, faster travel became possible across many cities and travelers could sometimes arrive at an earlier local time than the one they had left. 3 The resulting small time differences between adjacent towns and cities were not critical when it took days to travel from place to place. But that has not always been the case.īefore the establishment of time zones in 1883, there were over 144 local times in North America. 1,10 These time zones, with boundaries that have for the most part been fixed for more than a century, are taken for granted by most Americans. and the five additional time zones used in Alaska, Hawaii and other U.S.
With the 2019 Fall release of the National Transportation Atlas Database (NTAD), a new map of the nation’s time zones is featured, showing the geographical boundaries of four time zones in the continental U.S.
Statistical Products and Data Main - Statistical 1.Transportation Maps and Geospatial Data.
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