5 ft and 1520 mm gauge railways
Track gauge
Railways with a railway track gauge of 5 ft first appeared in the United Kingdom and the United States. This gauge became commonly known as Russian gauge because the government of the Russian Empire later chose it in 1843 — former areas of the Empire have inherited this standard. Wikipedia
Most railways in Europe use the standard gauge of 1,435 mm ( 4 ft 81⁄2 in). Some countries use broad gauge, of which there are three types.
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