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

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

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

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

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

An obsolete gauge of 1,422 mm (4 ft 8 in), formerly used in Scotland.

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

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

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

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.

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

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

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

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

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

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

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