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A 1,067 mm (3 ft 6 in) gauge used extensively in southern and eastern Africa, as well as in Japan.

A 5 ft 2 in (1,575 mm) gauge used by streetcar systems in parts of the United States, particularly Ohio.

A very narrow gauge of 610 mm (2 ft), often used for industrial, plantation, or light utility railways.

A broad gauge of 1,676 mm (5 ft 6 in) mainly used in India, Pakistan, western Bangladesh, Sri Lanka, Argentina, and Chile.

An obsolete gauge of 2,140 mm (7 ft 0 1⁄4 in) created by Isambard Kingdom Brunel for the Great Western Railway in Britain.

A 1,500 mm gauge that is uncommon and has few current examples.

A gauge measuring exactly 4 ft (1,219 mm), which was used mainly in the northeastern United States during the 19th century.

A gauge of 1,435 mm (4 ft 8 1⁄2 in), most widely used worldwide.

A 1,520 mm (4 ft 11 27⁄32 in) gauge used extensively in Russia and other countries of the former Soviet Union.

A 5 ft 2 1⁄4 in (1,581 mm) gauge mostly found in tram and light rail systems in Pennsylvania, USA.

A narrow gauge of 914 mm (3 ft) used mainly for specialized and industrial railways.

Gauges wider than standard gauge, often found in countries with large populations.

Gauges narrower than standard gauge, used for lower-volume, smaller infrastructure.

A gauge of 1,668 mm (5 ft 5 21⁄32 in), primarily found in Spain and Portugal.

A narrow gauge of 760 mm (2 ft 5 15⁄16 in) used in parts of Europe, commonly associated with the Bosnia and Herzegovina region.

A broad gauge of 6 ft (1,829 mm) that was used in parts of the northeastern United States, primarily in the 19th century.

Another name for standard gauge, 1,435 mm (4 ft 8 1⁄2 in), proposed by George Stephenson.

A gauge of 1,000 mm (3 ft 3 3⁄8 in) common in some countries with lower traffic volume.

An obsolete gauge exactly 4 ft 8 in (1,422 mm) which was used in early British railways before the standard gauge was finalized.