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Track gauge
By transport mode
Tram
Rapid transit
Miniature
Scale model
By size (list)
Minimum
Minimum
Fifteen inch
381 mm
(15 in)
Narrow
600 mm
Two foot
Two foot three inch
600 mm
610 mm
686 mm
(1 ft 11+5⁄8 in)
(2 ft)
(2 ft 3 in)
750 mm
Bosnian gauge
Two foot six inch
750 mm
760 mm
762 mm
(2 ft 5+1⁄2 in)
(2 ft 5+15⁄16 in)
(2 ft 6 in)
Swedish three foot
900 mm
Three foot
Italian metre
891 mm
900 mm
914 mm
950 mm
(2 ft 11+3⁄32 in)
(2 ft 11+7⁄16 in)
(3 ft)
(3 ft1+13⁄32 in)
Metre
1,000 mm
(3 ft 3+3⁄8 in)
Three foot six inch
1,067 mm
(3 ft 6 in)
Four foot
1,219 mm
(4 ft)
Four foot six inch
1,372 mm
(4 ft 6 in)
1432 mm
1,432 mm
(4 ft 8+3⁄8 in)
Standard
1,435 mm
(4 ft 8+1⁄2 in)
Broad
Italian broad gauge
Dresden gauge
1,445 mm
1,450 mm
(4 ft 8+7⁄8 in)
(4 ft 9+3⁄32 in)
Leipzig gauge
1,458 mm
(4 ft 9+13⁄32 in)
Toronto gauge
1,495 mm
(4 ft 10+7⁄8 in)
1520 mm
Five foot
1,520 mm
1,524 mm
(4 ft 11+27⁄32 in)
(5 ft)
Pennsylvania gauge
Pennsylvania gauge
Five foot three inch
1,581 mm
1,588 mm
1,600 mm
(5 ft 2+1⁄4 in)
(5 ft 2+1⁄2 in)
(5 ft 3 in)
Baltimore gauge
1,638 mm
(5 ft 4+1⁄2 in)
Iberian gauge
Five foot six inch
1,668 mm
1,676 mm
(5 ft 5+21⁄32 in)
(5 ft 6 in)
Six foot
1,829 mm
(6 ft)
Brunel
2,140 mm
(7 ft 1⁄4 in)
Change of gauge
Break-of-gauge
Dual gauge
Conversion
list
Bogie exchange
Variable gauge
By location
North America
South America
Europe
Australia
Further information: List of rail gauges
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.
As well as the usual reasons for having one gauge i.e. being able to operate through trains without transfer arrangements, the North American continent-wide system of freight car interchange with rolling stock having the same standard gauge, couplings, and air brakes meant that individual companies could minimise their rolling stock requirements by borrowing from other companies. Peak demand periods varied over the continent, with seasonal requirements e.g. for grain shipments occurring at different times in different areas so that freight cars could be redistributed to cover peaks as required.
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railway track (British English and UIC terminology) or railroad track (American English), also known as a train track or permanent way (often "perway" in Australia)...
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