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The standard gauge for railroad tracks is 4 feet 8.5 inches (1.4 meters). This width, which originated with George Stephenson's first line in 1829, is used on about three-fifths of the world's rail trackage.12

The gauge, or the distance between the inside faces of the running rails, significantly impacts construction and operating costs. Narrower gauges can be cheaper to build and allow for sharper curves but offer less lateral stability, limiting operating speeds. Notable deviations from the standard gauge include Russia's 5-foot gauge and Japan's 3-foot 6-inch gauge. Some countries, like Pakistan, even operate on multiple gauges.23

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