In railway terminology, Russian gauge refers to railway track with a gauge between 1,520 mm and 1,524 mm (5 ft). In a narrow sense as defined by Russian Railways it refers to 1,520 mm (4 ft 11 5⁄6 in) gauge.
The primary installed base of Russian gauge is across the states of the former Soviet Union (CIS states, Baltic states and Georgia), also Mongolia and Finland, representing ca. 225,000 km (140,000 mi) of track. The Russian gauge is the second most widely used gauge in the world—after 1,435 mm (4 ft 8 1⁄2 in) (standard gauge). Comparatively short sections of Russian-gauge railways also extend beyond the borders of the former USSR, Mongolia and Finland into Poland, eastern Slovakia, Sweden (at the Finnish border at Haparanda), and northern Afghanistan. There is an approximately 150 km long section in Hungary in the Záhony logistics area close to the Ukrainian border.
Read more about Russian Gauge: Redefinitions, Tolerances, Outside The Russian Empire, See Also
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“From being a patriotic myth, the Russian people have become an awful reality.”
—Leon Trotsky (1879–1940)