Track gauge in North America | Pwojczyn Easy Search

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Minimum
Fifteen inch	381 mm	(15 in)

Narrow
600 mm	600 mm	(1 ft 11+5⁄8 in)
Two foot	610 mm	(2 ft)
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 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	1,445 mm	(4 ft 8+7⁄8 in)
Dresden gauge	1,450 mm	(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	1,520 mm	(4 ft 11+27⁄32 in)
Five foot	1,524 mm	(5 ft)
Pennsylvania gauge	1,581 mm	(5 ft 2+1⁄4 in)
Pennsylvania gauge	1,588 mm	(5 ft 2+1⁄2 in)
Five foot three inch	1,600 mm	(5 ft 3 in)
Baltimore gauge	1,638 mm	(5 ft 4+1⁄2 in)
Iberian gauge	1,668 mm	(5 ft 5+21⁄32 in)
Five foot six inch	1,676 mm	(5 ft 6 in)
Six foot	1,829 mm	(6 ft)
Brunel	2,140 mm	(7 ft 1⁄4 in)
Breitspurbahn	3,000 mm	(9 ft 101⁄8 in)

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.