Track gauges which have been in use around the world.
NB! This list is not complete. We are grateful for contributions and corrections.

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.

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.