380 mm	England	Romney, Hythe and Dymchurch: miniature passenge carrying railway.
457 mm	England	Industrial railway in Crewe. Equal to 1 foot 5 inches (english).
500 mm	All the world	Industrial and military railways.
520 mm	Sweden	Industrial line at Sandvikens Järnverk.
600 mm	Sweden, Wales, Namibia, all over the world	"Decauville" gauge. Military and industrial railways. In Wales, among others, the Ffestiniog Railway. In Namibia converted to 1067 mm after WW2.
610 mm	India, All the world
650 mm	Marokko
686 mm	British Commonwealth	Equal to 2 feet 3 inches (english).
693 mm	Sweden	Industrial line at Kvarnsvedens Pappersbruk.
700 mm	All the world	Industrial and military railways.
750 mm	The former Soviet Union, Argentina, all the world.	Widely used narrow gauge, also military and industrial lines. In Argentina the Rio Turbio mining railway.
760 mm	Bosnia, Austria, India, Cuba	"Bosnian" gauge. Widely used in the former Austrian-Hungarian empire.
762 mm	India, South-Africa, Cuba	In South Africa widened to 1067 mm.
785 mm	Poland, Eastern Europe	Various short lines.
791 mm	Denmark	Faxe Railway
800 mm	Switzerland, Sweden	E.g. the Wengernalpbahn
802 mm	Sweden	E.g. the Bredsjö-Degerfors line.
838 mm	British Commonwealth	Equal to 2 feet 9 inches (english).
880 mm	Norway	Industrial line at Sundland Torvstrofabrikk.
891 mm	Sweden	Equal to 3 feet (swedish).
900 mm	All the world	Industrial lines.
914 mm	New Zealand, Isle of Man, USA, Cuba, All the world	Equal to 3 feet (english). In the USA, among others, the D&RGW.
915 mm	Peru
950 mm	Eritrea, Italy	"Standard" narrow gauge in Italy, who ruled Eritrea at one time.
991 mm	British Commonwealth	Equal to 3 feet 3 inches (english).
1000 mm	Switzerland, India, Africa, Vietnam	Widely used narrow gauge, all over the world. Equal to 3 feet 3 3/8 inches (english).
1050 mm	Turkey, Syria, Lebanon, Jordan, Saudi Arabia	E.g. the Mecca Railway, destroyed by Lawrence of Arabia south of Amman, Jordan.
1055 mm	French colonies
1065 mm	South Africa	After 1990, the Spoornet (South African Railways) have standardized this gauge, replacing 1067 mm.
1067 mm	South Africa, Japan, Norway, New Zealand, Indonesia, Austr. (Queensland and W. Australia)	"Kapp-gauge"
1093 mm	Sweden	E.g. the Köping-Uttersberg Railway and the industrial line Surahammar -Lisjö.
1099 mm	Sweden
1100 mm	Belgium	The railway Antwerp-Ghent until 1896, then converted to standard gauge.
1101 mm	Sweden	Fryckstad Clara Elfs Railway. Equal to 3 feet 8 1/2 inch (swedish).
1106 mm	Austria	The horse railway Budweis (now Ceske Budejovice in the Czech Republic) - Linz (200 km long). Converted to standard gauge.
1188 mm	Sweden	Equal to 4 feet (swedish).
1219 mm	Sweden	Equal to 4 feet (english).
1422 mm	England	The gauge George Stephenson started out with: 4 feet 8 inches (english). He quickly discovered that things ran better if he added another half an inch to the gauge.
1431 mm	Sweden	The Stockholm Underground Railway was originally built to this gauge. Later additions and changes have been built to standard gauge.
1432 mm	Europe, Japan	Standard gauge turned out to be on the wide side for high speed railways. So 3 mm were pinched off.
1435 mm	All the world, with exeptions	"Standard" gauge. (4 feet 8 1/2 inches, english)
1440 mm	Belgium, France	Converted to standard gauge.
1473 mm	USA	Camden & Amboy, NJ & Ohio, both converted to standard gauge.
1524 mm	The former Soviet Union, China, Finland, USA, Poland	In the USA standard in the South until1886. The first transcontinental railway in the USA (UP / SP) was to be built to this gauge, but this was reconsidered before construction started. In Poland converted to standard gauge in 1918.
1600 mm	Ireland, Australia (South Austr., Victoria) Bayern	"Irish" gauge. In Bavaria (Germany) converted to standard gauge before 1870.
1672 mm	Spain	Later converted to 1676 mm.
1676 mm	Spain, India, Canada, Portugal	In Canada (and a line across the border to Portland, Maine, USA) until 1870, then converted to standard gauge.
1814 mm	Russia, USA	In Russia converted to 1524 mm. In the USA (New York to St. Louis, Erie and others) 1865 - 1871, then converted to standard gauge.
1829 mm	USA
1940 mm	The Netherlands	Converted to standard gauge.
2000 mm	Germany	Planned by Hitler's "Third Reich" during WW2 as a super railway with bi-level rolling stock, first between Berlin and Munich. Construction never got under way.
2134 mm	England	Great Western Railway (or "God's Wonderful Railway" as it was called by some). Only converted to standard gauge in 1892.
2440 mm	Oregon	Logging railways during the 1880s.

Note:
In Australia railway construction got under way in three different places. The engineers came from England, Scotland and Ireland.
The Englishman, odd as it may seem, started building narrow gauge (1067 mm)
The Scot built standard gauge.
The Irishman of course built his line to the Irish gauge (1600 mm).
Only in the 1970s one might at long last travel across the country from coast to coast without changing trains tree times.