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4 ft 6 in gauge railway - Wikipedia

The 4 ft 6 in (1,372 mm) track gauge, also called the Scotch gauge, was adopted by early 19th century railways mainly in the Lanarkshire area of Scotland. It differed from the gauge of 4 ft 8 in (1,422 mm) that was used on some early lines in England. Early railways chose their own gauge, but later in the century interchange of equipment was facilitated by establishing a uniform rail gauge across railways: a so-called 'standard gauge' of 4 ft 8 1⁄2 in (1,435 mm). In the early 1840s standard gauge lines began to be constructed in Scotland, and all the Scotch Gauge lines were eventually converted to standard gauge. //  Дальше — en.wikipedia.org