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The distance between the inside edges of the heads of the rails is defined to be 1,435 mm except in the United States, Canada, and on some heritage British lines, where it is defined in U.S. customary/customary UK units as exactly "four feet eight and one half inches", [7] which is equivalent to 1,435.1 mm.
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
Two foot three inch: 686 mm (2 ft 3 in) 750 mm: 750 mm (2 ft 5 + 1 ⁄ 2 in) Bosnian gauge: 760 mm (2 ft 5 + 15 ⁄ 16 in) Two foot six inch: 762 mm (2 ft 6 in) Swedish three foot: 891 mm (2 ft 11 + 3 ⁄ 32 in) 900 mm: 900 mm (2 ft 11 + 7 ⁄ 16 in) Three foot: 914 mm (3 ft) Italian metre: 950 mm (3 ft 1 + 13 ⁄ 32 in) Metre: 1,000 mm (3 ft 3 ...
Two foot three inch: 686 mm (2 ft 3 in) 750 mm: 750 mm (2 ft 5 + 1 ⁄ 2 in) Bosnian gauge: 760 mm (2 ft 5 + 15 ⁄ 16 in) Two foot six inch: 762 mm (2 ft 6 in) Swedish three foot: 891 mm (2 ft 11 + 3 ⁄ 32 in) 900 mm: 900 mm (2 ft 11 + 7 ⁄ 16 in) Three foot: 914 mm (3 ft) Italian metre: 950 mm (3 ft 1 + 13 ⁄ 32 in) Metre: 1,000 mm (3 ft 3 ...
If the difference between the two gauges is large enough – for example between 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge and 3 ft 6 in (1,067 mm) – three-rail dual-gauge is possible, but if not – for example between 3 ft 6 in (1,067 mm) and 1,000 mm (3 ft 3 + 3 ⁄ 8 in) metre gauge – four rails must be used. Dual-gauge rail lines ...
For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use.From 1893, the foot was legally defined as exactly 1200 ⁄ 3937 m (approximately 0.304 8006 m). [13]
Under the Harappan linear measures, Indus cities during the Bronze Age used a foot of 13.2 inches (335 mm) and a cubit of 20.8 inches (528 mm). [11] The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in).
A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement.It is equal to 1 / 36 yard or 1 / 12 of a foot.