Three-dimensional geometry of track layouts and associated measurements
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
Track geometry is concerned with the properties and relations of points, lines, curves, and surfaces[1] in the three-dimensional positioning of railroad track. The term is also applied to measurements used in design, construction and maintenance of track. 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.
^"geometry". Cambridge Dictionary. Cambridge University Press. 2021. Retrieved 21 October 2021.
^"Federal Railroad Administration Federal Track Safety Standards Fact Sheet" (PDF). Federal Railroad Administration. Retrieved 8 November 2012.
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