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The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Railroad managers tried to address the problem by establishing 100 railroad time zones, but this was only a partial solution to the problem. [2] Weather service chief Cleveland Abbe introduced four standard time zones for his weather stations, an idea which he offered to the railroads. [3]
The Northern Pacific Railroad had seven time zones between St. Paul and the 1883 west end of the railroad at Wallula Jct; the Union Pacific Railway was at the other extreme, with only two time zones between Omaha and Ogden. [3] In 1870, Charles F. Dowd proposed four time zones based on the meridian through Washington, DC, for North American ...
Proposals had been put forward for at least one meridian–based time zone for India as early as 1884. However, no consensus could be reached until 1906, when a single time zone based on Allahabad was established, and a standard time was introduced, which the railways came in line with. Despite this, Kolkata kept its own time until 1948 and to ...
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
It included a fifth time zone for eastern Canada, called Intercolonial Time after the Intercolonial Railway serving eastern Canada. [3] Each of these boundary cities had to adopt one of the two railroad zones or continue to use local mean solar time. The 1918 Standard Time Act moved the borders to relatively rural areas.
In 1913, Chicago's four elevated railroad companies came together to form the Chicago Elevated Railways Collateral Trust establishing crosstown services for the first time. In 1924 all four companies were formally united to form the Chicago Rapid Transit Company. [17] The Chicago Transit Authority took over the
Metra (reporting mark METX) is the primary commuter rail system [a] in the Chicago metropolitan area serving the city of Chicago and its surrounding suburbs via the Union Pacific Railroad, BNSF Railway, and other railroads. The system operates 243 stations on 11 rail lines. [4]