This category contains categories of track gauge by their metric definition or metric equivalent.

Track gauges	Category	Range (imperial)	Range (metric)	by size	other
This subtable: v t e
Scaled gauges	Category	smaller than ~4 in	smaller than ~100 mm	by size	by scale
Minimum gauge	Category	15 in – 18 in	400 mm – 500 mm	by size
Narrow gauge	Category	> 18 in – < 4 ft 8+1⁄2 in	> 500 mm – < 1,435 mm	by size	by country
Standard gauge	Category	4 ft 8+1⁄2 in	1,435 mm		by country
Broad gauge	Category	> 4 ft 8+1⁄2 in	> 1,435 mm	by size

Lists of gauges By name By imperial unit By metric unit

Track gauges are ordered by actual track gauge, not by title or unit name.