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Some amount of tolerance is necessarily allowed from the nominal gauge to allow for wear, etc.; this tolerance is typically greater for track limited to slower speeds, and tighter for track where higher speeds are expected (as an example, in the US the gauge is allowed to vary between 4 ft 8 in (1,420 mm) to 4 ft 10 in (1,470 mm) for track ...
A broad-gauge railway is a railway with a track gauge (the distance between the rails) broader than the 1,435 mm (4 ft 8 + 1 ⁄ 2 in) used by standard-gauge railways.. Broad gauge of 1,520 mm (4 ft 11 + 27 ⁄ 32 in), more known as Russian gauge, is the dominant track gauge in former Soviet Union countries (CIS states, Baltic states, Georgia, Ukraine) and Mongolia.
4 ft 6 in: See 4 ft 6 in gauge railway: 1,384 mm 4 ft 6 + 1 ⁄ 2 in: Scotland various railways in Scotland prior to 1840 1,397 mm 4 ft 7 in: Wales Duffryn Llynvi and Porthcawl Railway [90] 1,416 mm 4 ft 7 + 3 ⁄ 4 in: England Huddersfield Corporation Tramways: Scotland List of town tramway systems in Scotland: 1,422 mm 4 ft 8 in: 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). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft ( 1,524 mm ), while northern railroads that were not standard-gauge tended to be narrow-gauge.
For GSP-UM 3019, an exceptionally large specimen that may belong to the same species, a total carapace length of 1.2 meters was extrapolated based on the known plastron remains. Following the same method applied to the Drazinderetes holotype, this would yield a total length between 1.5 m (4.9 ft) to 2.182 m (7.16 ft) meters.
New lines and extensions to the MTR after 2014 use 1,435 mm (4 ft 8 + 1 ⁄ 2 in) gauge, including the South Island line, Kwun Tong line extension and West Island line. The Bucharest Metro uses 1,432 mm (4 ft 8 + 3 ⁄ 8 in) gauge. The Washington Metro uses 4 ft 8 + 1 ⁄ 4 in (1,429 mm), 1 ⁄ 4 in (6 mm) narrower than standard gauge.
These locomotives had 20-by-28-inch (508 mm × 711 mm) inside cylinders driving 4-foot-11-inch (1.499 m) wheels. They had a distinctive front overhang, not possessed by any other GER 0-6-0 class. This was needed to clear the cylinder tail rods. [ 1 ]
Comparison of 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge (blue) and 3 ft 6 in (1,067 mm) (red) width; the difference is 14.5 in (370 mm), or about 26 per cent of standard gauge. 1,067 mm ( 3 ft 6 in ) between the inside of the rail heads, its name and classification vary worldwide and it has about 112,000 kilometres (70,000 mi) of track.