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Cross-section of 4-rail dual-gauge track (standard and metre gauge/ narrow gauge) (click to enlarge) Cross-section of Australian dual-gauge track – 1600 mm (5 ft 3 in) and 1435 mm (4 ft 8 + 1 ⁄ 2 in) gauges (click to enlarge) Mixed gauge track at Sassari, Sardinia: 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge and 950 mm (3 ft 1 + 3 ⁄ 8 in)
This rail gauge was soon changed to 7 ft 1 ⁄ 4 in (2,140 mm) [105] to ease running in curves. 2,140 mm 7 ft 1 ⁄ 4 in: South Africa East London and Table Bay harbour railways England Brunel's Great Western Railway until converted to standard gauge by May 1892, see Great Western Railway The "gauge war".
Originally, various track gauges were used in the United States.Some railways, primarily in the northeast, used standard gauge of 4 ft 8 + 1 ⁄ 2 in (1,435 mm); others used gauges ranging from 2 ft (610 mm) to 6 ft (1,829 mm).
Three foot gauge railways have a track gauge of 3 ft (914 mm) or 1 yard. This gauge is a narrow gauge and is generally found throughout North , Central , and South America . In Ireland , many secondary and industrial lines were built to 3 ft gauge, and it is the dominant gauge on the Isle of Man , where it is known as the Manx Standard Gauge .
The vast majority of North American railroads are standard gauge (4 ft 8 + 1 ⁄ 2 in / 1,435 mm).Exceptions include some streetcar, subway and rapid transit systems, mining and tunneling operations, and some narrow-gauge lines particularly in the west, e.g. the isolated White Pass and Yukon Route system, and the former Newfoundland Railway.
Three-rail dual-gauge track is joined by four-rail triple-gauge. [k] 1600 / 1435 / 1067mm (5 ft 3 / 4 ft 8 1 / 2 in / 3 ft 6 in). Standard-gauge car on 4-rail triple-gauge track. Narrow gauge track is two central rails; broad gauge is far left rail and second from right. [l] 1600 / 1435 / 1067 mm (5 ft 3 / 4 ft 8 1 / 2 / 3 ft 6 in).
Measurement of track spacing from the rail head to rail head. By definition, the track spacing is given from centre to centre of a rail track. For an actual construction the distance is measured from the inside of a rail head to the matching one of the other track. As far as both tracks have the same gauge this is the same distance.
Track geometry involves standards, speed limits and other regulations in the areas of track gauge, alignment, elevation, curvature and track surface. [2] [failed verification] Standards are usually separately expressed for horizontal and vertical layouts although track geometry is three-dimensional.
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