|By transport mode|
|Tram · Rapid transit
Miniature · Scale model
|By size (list)|
|Change of gauge|
|Break-of-gauge · Dual gauge ·
Conversion (list) · Bogie exchange · Variable gauge
|North America · South America · Europe|
The standard gauge (also Stephenson gauge after George Stephenson, International gauge or normal gauge) is a widely used railway track gauge. Approximately 60% of lines in the world are this gauge (see the list of countries that use the standard gauge). Except for Russia, Uzbekistan, and Finland, all high-speed lines are this gauge.
The distance between the inside edges of the rails is defined to be 1,435 millimetres (4 ft 8 1⁄2 in). In the United States and Canada, it is still defined in imperial units, 4 feet 8 1⁄2 inches (1,435 mm). It is also called UIC gauge, or UIC track gauge, the European gauge in the EU and Russia, or uniform gauge in Queensland.
- 1 History
- 2 Modern almost-standard gauge railways
- 3 Road vehicles
- 4 Legislation
- 5 Installations
- 6 See also
- 7 Notes
- 8 References
- 9 Further reading
- 10 External links
As railways developed and expanded one of the key issues was track gauge (the distance, or width, between the inner sides of the rails) to be used. The result was the adoption throughout a large part of the world of a “standard gauge” of 4 ft 8 1⁄2 in allowing inter-connectivity and inter-operability.
In England some early lines in colliery (coal mining) areas in the northeast were 4 ft 8 in (1,422 mm); and in Scotland some early lines were 4 ft 6 in (1,372 mm) (Scotch gauge). By 1846, in both countries, these lines were widened to standard gauge. Parts of the United States, mainly in the Northeast, adopted the same gauge because some early trains were purchased from Britain. However, until well into the second half of the 19th century Britain and the USA had several different track gauges. The American gauges converged as the advantages of equipment interchange became increasingly apparent; notably, the South's 5 ft (1,524 mm) broad gauge was converted to be compatible with standard gauge over the course of two days beginning 31 May 1886. See Track gauge in the United States.
With the advent of metrication, standard gauge was redefined as 1,435 mm, a reduction of 0.1 mm, but well within existing tolerance limits. The exception is the United States, where standard gauge continues to be defined in terms of customary units.
A popular legend that has been around since at least 1937 traces the origin of the 4 ft 8 1⁄2 in gauge even further back than the coalfields of northern England, pointing to the evidence of rutted roads marked by chariot wheels dating from the Roman Empire.[lower-alpha 1] Snopes categorized this legend as false but commented that “... it is perhaps more fairly labelled as 'True, but for trivial and unremarkable reasons.'" The historical tendency to place the wheels of horse-drawn vehicles approximately 5 feet (1,500 mm) apart probably derives from the width needed to fit a carthorse in between the shafts. In addition, while road-traveling vehicles are typically measured from the outermost portions of the wheel rims (and there is some evidence that the first railroads were measured in this way as well), it became apparent that for vehicles travelling on rails it was better to have the wheel flanges located inside the rails, and thus the distance measured on the inside of the wheels (and, by extension, the inside faces of the rail heads), was the important one.
There was no standard gauge for horse railways, but there were rough groupings: in the north of England none were less than 4 ft (1,219 mm). Wylam colliery's system, built before 1763, was 5 ft (1,524 mm); as was John Blenkinsop's Middleton Railway, the old 4 ft (1,219 mm) plateway was relaid to 5 ft (1,524 mm) so that Blenkinsop's engine could be used. Others were 4 ft 4 in (1,321 mm) Beamish or 4 ft 7 1⁄2 in (Bigges Main and Kenton and Coxlodge).
The English railway pioneer George Stephenson spent much of his early engineering career working for the coal mines of County Durham. He favoured 4 ft 8 in (1,422 mm) for wagonways in Northumberland and Durham and used it on his Killingworth line. The Hetton and Springwell wagonways also used this gauge.
Stephenson's Stockton and Darlington railway (S&DR) was built primarily to transport coal from mines near Shildon to the port at Stockton-on-Tees. The initial gauge of 4 ft 8 in (1,422 mm) was set to accommodate the existing gauge of hundreds of horse-drawn chaldron wagons that were already in use on the wagonways in the mines. The railway used this gauge for 15 years before a change was made to 4 ft 8 1⁄2 in gauge. The historic Mount Washington Cog Railway, the world's first mountain-climbing rack railway, is still in operation in the 21st century, and has used the earlier 4 ft 8 in gauge since its inauguration in 1868.
The beginnings of the 4 ft 8 1⁄2 in gauge
George Stephenson used the 4 ft 8 1⁄2 in gauge (including a belated extra 1⁄2 in (13 mm) of free movement to reduce binding on curves) for the Liverpool and Manchester Railway, authorised in 1826 and opened 30 September 1830. The success of this project led to George Stephenson and his son Robert being employed to engineer several other larger railway projects.
- Monkland and Kirkintilloch Railway, authorised 1824, opened 1825, used 4 ft 6 in (1,372 mm).
- Dundee and Newtyle Railway, authorised 1829, opened 1831, used 4 ft 6 1⁄2 in (1,384 mm).
- the Eastern Counties Railway, authorised on 4 July 1836, used 5 ft (1,524 mm)
- the London and Blackwall Railway, authorised on 28 July 1836, used 5 ft 1⁄2 in (1,537 mm);
- the Dundee and Arbroath Railway, incorporated on 19 May 1836, opened October 1838, used 5 ft 6 in (1,676 mm) until standardised in 1847.
- the Arbroath and Forfar Railway, incorporated on 19 May 1836, opened November 1838, used 5 ft 6 in.
- the Northern and Eastern Railway, authorised on 4 July 1836, used 5 ft (1,524 mm) gauge.
- Aberdeen Railway, opened 1848, used 5 ft 6 in (1,676 mm) until standardised.
Almost standard gauge
- the Killingworth Colliery tramway; 4 ft 8 in (1,422 mm) 
- the Hetton colliery railway; opened 1822; engineered by George Stephenson 4 ft 8 in (1,422 mm) 
- the Stockton and Darlington Railway; opened 1825; original gauge 4 ft 8 in (1,422 mm)
- the Chester and Birkenhead Railway, authorised on 12 July 1837, used 4 ft 9 in (1,448 mm);
- the London and Brighton Railway, authorised on 15 July 1837, used 4 ft 9 in (1,448 mm);
- the Manchester and Birmingham Railway, authorised on 30 June 1837, used 4 ft 9 in (1,448 mm);
- the Manchester and Leeds Railway, authorised on 4 July 1836, used 4 ft 9 in (1,448 mm) and
- The 4 ft 9 in (1,448 mm) railways were intended to take 4 ft 8 1⁄2 in (1,435 mm) gauge vehicles and allow a (second) running tolerance.
- The Trams in Dresden, authorized in 1872 as horsecars, used 1,440 mm (4 ft 8 11⁄16 in) gauge vehicles. Converted to 600V DC electric trams in 1893, uses 1,450 mm (4 ft 9 3⁄32 in); both gagues are within the tolerance for standard gauge
- the Bolton and Leigh Railway, authorised 1825, opened 1828; connected to LMR.
- the Saint-Étienne–Lyon railway, commenced 1826, opened 1833.
- the Grand Junction Railway, authorised 1833, opened 1837; connected to LMR.
- the Newcastle & Carlisle Railway, authorised 1829, opened 1834; isolated from LMR, engineered by Robert Stephenson
- the Manchester and Birmingham Railway, authorised 1837, opened 1840; connected to LMR.
- the London and Birmingham Railway, authorised 1833, opened 1838, connected to LMR.
- the Birmingham and Gloucester Railway, authorised 1836, open 1840, connected to LMR.
During the "gauge war" with the Great Western Railway, standard gauge was called "narrow gauge". The modern use of narrow gauge for gauges less than standard did not arise for 20 years, until the first such locomotive-hauled passenger railway, the Festiniog.
- Cheltenham and Great Western Union Railway—authorised 1836; opened 1840; dual gauge 1843 1,435 mm (4 ft 8 1⁄2 in) and 7 ft 1⁄4 in (2,140 mm).
The Royal Commission
In 1845, in the United Kingdom of Great Britain and Ireland, a Royal Commission on Railway Gauges reported in favour of a standard gauge. In Great Britain, Stephenson's gauge was chosen on the grounds that lines of this gauge were eight times longer than those of the rival 7 ft (2,134 mm)7 ft 1⁄4 in gauge adopted principally by the Great Western Railway. The subsequent Gauge Act ruled that new passenger-carrying railways in Great Britain should be built to a standard gauge of 1,435 mm (4 ft 8 1⁄2 in), and those in Ireland to a new standard gauge of 5 ft 3 in (1,600 mm). It allowed the broad-gauge companies in Great Britain to continue with their tracks and expanding their networks within the "Limits of Deviation" and the exceptions defined in the Act. After an intervening period of mixed-gauge operation (tracks were laid with three rails), the Great Western Railway finally converted its entire network to standard gauge in 1892.
The Royal Commission made no comment about small to-be-called "narrow"-gauge lines, such as the Festiniog Railway, which allowed a future multiplicity of small gauges in the UK; it also made no comments about future gauges in British colonies.
Robert Stephenson was reported to have said that if he had a second chance to choose a standard gauge, he would choose one wider than 1,435 mm (4 ft 8 1⁄2 in). "I would take a few inches more, but a very few".
Modern almost-standard gauge railways
- The Mount Washington Cog Railway, the world's oldest cog railway (1868) and still in operation, uses a slightly-narrower 4 ft 8 in (1,422 mm) gauge.
- The MTR in Hong Kong uses 1,432 mm (4 ft 8 3⁄8 in) except on the East Rail, West Rail, Ma On Shan lines, and Light Rail
- The Toronto streetcar system uses 4 ft 10 7⁄8 in (1,495 mm) Toronto gauge
- The Washington Metro uses 4 ft 8 1⁄4 in (1,429 mm)
- United Kingdom: Regulating the Gauge of Railways Act 1846
|Albania||National rail network||339 km (211 mi)|
|Algeria||National rail network||3,973 km (2,469 mi)|
|Argentina||General Urquiza Railway (except Ferrocarril Económico Correntino in 600 mm (1 ft 11 5⁄8 in))
Buenos Aires Underground
Tren de la Costa
|Other major lines are mostly 1,676 mm (5 ft 6 in) broad gauge (Indian gauge), apart from the metre gauge General Belgrano Railway|
|Australia||Pacific National, Pilbara Railways||Of the Australian states only NSW adopted standard gauge. However, all mainland state and territory capitals are now linked by a standard gauge network.|
|Austria||Österreichische Bundesbahnen||The Semmering railway has UNESCO World Heritage Site status|
|Bangladesh||Only used for rapid transit systems: Dhaka Metro|
|Belgium||NMBS/SNCB, Brussels Metro and tramway|
|Bosnia and Herzegovina||Željeznice Federacije Bosne i Hercegovine and Željeznice Republike Srpske,
|Brazil||Estrada de Ferro do Amapá; from Uruguaiana to the border of Argentina and from Santana do Livramento to the border of Uruguay (both mixed gauge 1,435 mm and 1,000 mm (3 ft 3 3⁄8 in) );
Remaining tracks at Jaguarão (Rio Grande do Sul) currently inoperable
|194 km (121 mi)|
|Bulgaria||National Railway Infrastructure Company (NRIC),
Bulgarian State Railways (BDZ),
Part of Sofia Tramway system
|Canada||National rail network||49,422 km (30,709 mi)|
|China||National rail network||103,144 km (64,091 mi)|
|Colombia||Metro de Medellín, Tren del Cerrejón, Metro de Bogotá|
|Cuba||Ferrocarriles de Cuba|
|Czech Republic||České dráhy
all tram systems in the country (Liberec has dual gauge 1,000/1,435 mm, with one meter-gauge interurban line to Jablonec nad Nisou)
Funicular in Prague
|Denmark||Banedanmark and Copenhagen Metro|
|Egypt||Egyptian National Railways|
|France||SNCF, RATP (on RER lines)|
|Germany||Deutsche Bahn, numerous local public transport providers|
|Greece||Hellenic Railways Organisation (operated by TrainOSE)||All modern Greek network, except in the Peloponnese|
|Hong Kong||MTR (former KCR network—East Rail Line, West Rail Line, Ma On Shan Line, Light Rail)||Other MTR lines use 1,432 mm (4 ft 8 3⁄8 in), instead of 4 ft 8 1⁄2 in|
Budapest metro, HÉV (Suburban railway)
Tram systems in Budapest, Debrecen, Miskolc, Szeged
Budapest cogwheel railway
|India||Only used for rapid transit systems: Bangalore Metro, Chennai Metro, Delhi Metro (Phase 2 onwards), Gurgaon Metro, Hyderabad Metro Rail, Jaipur Metro, Kochi Metro, Kolkata Metro (Line 2 onwards), Trams in Kolkata, Lucknow Metro, Mumbai Metro, Navi Mumbai Metro||Indian heavy rail systems (Indian Railways) use 1,676 mm (5 ft 6 in) Indian broad gauge. The majority of under construction and future Metro Rail systems prefer Standard Gauge.|
|Indonesia||Built in Aceh Province|
|Iran||Islamic Republic of Iran Railways|
|Iraq||Iraqi Republic Railways|
|Ireland||Railway Procurement Agency||Luas in Dublin|
|Israel||Israel Railways, CTS, operating the Jerusalem Light Rail|
|Italy||Ferrovie dello Stato|
|Japan||Shinkansen, JR Hokkaido Naebo Works (see Train on Train), Keisei Line, Keikyu Line Tokyo Metro Ginza Line, Tokyo Metro Marunouchi Line, Toei Asakusa Line, Toei Oedo Line, Kintetsu Corp (not including the Minami-Osaka Line (1,067 mm), etc.), Keihan Railway, Hankyu Railway, Hanshin Railway, Kyoto Municipal Subway, Osaka Municipal Subway.||All other subway lines in Japan, except for the Toei Shinjuku Line (1,372 mm (4 ft 6 in) scotch gauge) and the Sapporo Subway (which is a rubber-tired system), use 1,067 mm (3 ft 6 in) cape gauge.|
|Kenya||network under construction|
|Lebanon||All lines out of service and more or less dismantled|
|Libya||network under construction|
|Luxembourg||Société Nationale des Chemins de Fer Luxembourgeois|
|Malaysia||RapidKL (Kelana Jaya Line, Ampang Line), KLIA Ekspres|
|Montenegro||Željeznice Crne Gore||3|
|Morocco||Rail transport in Morocco|
|Netherlands||Nederlandse Spoorwegen and regional railways.|
|North Korea||Railways of the DPRK.|
|Norway||Norwegian National Rail Administration, Rail transport in Norway|
|Panama||Panama Railway||since 2000|
|Paraguay||Ferrocarril Presidente Don Carlos Antonio López, now Ferrocarril de Paraguay S.A. (FEPASA)||Now working on 36 km out of Asunción as a tourist steam line; also on 5 km from Encarnación to the border of Argentina, carrying mainly exported soy; the rest of the 441 km of the line awaits its fate, while redevelopment plans come and go with regularity. The section from west of Encarnación to north of San Salvador and the complete San Salvador–Abaí branch have been dismantled by the railway itself to get funds through selling scrap.|
|Peru||Railroad Development Corporation Ferrocarril Central Andino Callao–Lima–La Oroya–Huancayo, La Oroya–Cerro del Pasco; Ferrocarril del sur de Peru operated by Peru Rail Matarani–Arequipa–Puno and Puno–Cuzco; Ilo–Moquegua mining railroad; Tacna–Arica (Chile) international line, operated by Tacna province; Electric suburban railway of Lima|
|Philippines||Manila LRT Line 1, Manila LRT Line 2 and Manila MRT Line 3.|
|Poland||Polskie Koleje Państwowe, Warsaw Metro, most tramway systems throughout the country|
|Portugal||Planned high-speed lines; Braga and Oporto (Guindais) funiculars; Lisbon Metro; Oporto Metro (partly adapted from former 1,000 mm tracks); Metro Transportes do Sul light rail in Almada.||All other 1,668 mm (5 ft 5 2⁄3 in) (broad gauge), some 1,000 mm (3 ft 3 3⁄8 in) (meter gauge), at least one 500 mm (Decauville).|
|Romania||Căile Ferate Române|
|Russia||Rostov-on-Don tramway, lines connecting Kaliningrad with Poland|
|Saudi Arabia||Rail transport in Saudi Arabia|
|Slovakia||Železnice Slovenskej republiky, Košice tramway system|
|South Africa||Gautrain in Gauteng Province||Rest of country uses Cape Gauge|
|Spain||AVE High-Speed Train lines from Madrid to Seville, Málaga, Saragossa, Barcelona (-Perthus), Toledo, Huesca and Valladolid, Barcelona Metro L2, L3, L4, L5 lines. Barcelona FGC lines L6, L7, and Metro Vallès S1, S2, S5, S55.||All other 1,668 mm (5 ft 5 2⁄3 in) (broad gauge) and some 1,000 mm (3 ft 3 3⁄8 in) (meter gauge).|
|Sweden||Swedish Transport Administration, Storstockholms Lokaltrafik (Stockholm metro, commuter and light rail lines), tram networks in Gothenburg and Norrköping|
|Switzerland||Swiss Federal Railways, BLS, Rigi Railways (rack railway)|
|Syria||Chemins de Fer Syriens|
|Taiwan||Taipei Rapid Transit System, Taiwan High Speed Rail, and Kaohsiung Mass Rapid Transit|
|Thailand||Bangkok Skytrain, Bangkok Metro and Suvarnabhumi Airport Link.|
|Tunisia||Northern part of the network|
|Turkey||Turkish State Railways (also operates Marmaray), metro networks, and tram networks||Some tram networks use metre gauge.|
|United Arab Emirates||Rail transport in the United Arab Emirates|
|United Kingdom (Great Britain)||Entire rail network in Great Britain (but not Ireland) (since standardisation by the Regulating the Gauge of Railways Act 1846)|
|United States||Modern national railroad network||See: Track gauge in the United States
The Washington Metro uses 4 ft 8 1⁄4 in (1,429 mm) gauge, which is 6 mm or 1⁄4″ closer than standard gauge.
|Uruguay||National rail network|
|Vietnam||North of Hanoi||Includes dual gauge (standard/metre) to the PRC border.|
- The gaps in the pedestrian crossings in Pompeii could give credence or otherwise to this statement, but no relevant studies appear to have been made.
- Francesco FALCO (23 January 2013). "EU support to help convert the Port of Barcelona's rail network to UIC gauge". TEN-T Executive Agency. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Spain: opening of the first standard UIC gauge cross-border corridor between Spain and France". UIC Communications. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Displaceable rolling bogie for railway vehicles". IP.com. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Francesco FALCO (31 December 2012). "2007-EE-27010-S". TEN-T Executive Agency. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Japan". Speedrail.ru. 1 October 1964. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "GE/GN8573" (PDF). Railway Group Guidance Note. London: Rail Safety and Standards Board. October 2004. Retrieved 29 January 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Standard Railway Gauge". Townsville Bulletin. 5 October 1937. p. 12. Retrieved 3 June 2011 – via National Library of Australia.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Railroad Gauges and Roman Chariots". Urban Legends Reference Pages. Snopes.com.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Baxter (1966), p. 56.
- Chaldron wagons
- Vaughan (1997).[page needed]
- Whishaw (1842), p. 91.
- "Public transport in and about the parish". London: St George-in-the-East Church. London and Blackwall Railway; London, Tilbury & Southend Railway.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Docklands Light Railway - Tower Gateway to West India Quay
- Whishaw (1842), p. 260.
- Whishaw (1842), p. 363.
- Jones (2013), p. 33.
- Whishaw (1842), p. 54.
- Whishaw (1842), p. 273.
- Whishaw (1842), p. 303.
- Whishaw (1842), p. 319.
- "Trans-Australian Railway. Bill Before The Senate". Western Mail (Western Australia). Perth, WA. 2 December 1911. p. 17. Retrieved 15 March 2013 – via National Library of Australia.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Peoples' Liberal Party". Bendigo Advertiser. 27 February 1912. p. 5. Retrieved 21 November 2013 – via National Library of Australia.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Jones (2009), pp. 64–65.
- "The Narrow-Gauge Question". The Argus. Melbourne. 2 October 1872. Retrieved 14 April 2012 – via Trove.nla.gov.au.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- CIA World Fact Book - Albania
- CIA World Fact Book - Algeria
- Setti (2008), p. 25.
- Sofia Underground
- Sofia Tramway system
- "香港鐵路(MTR)". 2427junction.com. 15 February 2006. Retrieved 20 August 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Allen (1987).[page needed]
- "Mexlist". 2007. Retrieved 29 November 2007.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Ferrocarril Central Andino". Railroad Development Corporation. 2007. Retrieved 29 November 2007.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "Railway Infrastructure". Vietnam Railways. 2005. Retrieved 29 November 2007.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Allen, Geoffrey Freeman (1987). Jane's World Railways, 1987–88. Jane's Information Group. ISBN 9780710608482.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Baxter, Bertran (1966). Stone Blocks and Iron Rails (Tramroads). Industrial Archaeology of the British Isles. Newton Abbot: David & Charles.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Jones, Robin (2013). The Rocket Men. Mortons Media Group. ISBN 9781909128279.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Jones, Stephen K. (2009). Brunel in South Wales. vol. II: Communications and Coal. Stroud: The History Press. pp. 64–65. ISBN 9780752449128.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Setti, João Bosco (2008). Brazilian Railroads. Rio de Janeiro: Memória do Trem. ISBN 9788586094095 – via Google Books.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Vaughan, A. (1997). Railwaymen, Politics and Money. London: John Murray. ISBN 0-7195-5150-1.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Whishaw, Francis (1842). The Railways of Great Britain and Ireland: Practically Described and Illustrated. London: John Weale. Republished 1969, David & Charles reprints: Newton Abbot. ISBN 0-7153-4786-1.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Pomeranz, Kenneth; Topik, Steven (1999). The World that Trade Created: Society, Culture, and World Economy, 1400 to the Present. Armonk, NY: M.E. Sharpe. ISBN 0-7656-0250-4.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Puffert, Douglas J. (2009). Tracks across Continents, Paths through History: The Economic Dynamics of Standardization in Railway Gauge. University of Chicago Press. ISBN 978-0-226-68509-0.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "The Sydney Morning Herald". The Sydney Morning Herald. 23 May 1892. p. 4. Retrieved 14 August 2011 – via National Library of Australia.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>, A discussion of gauge in Australia, c.1892
- A learned text of standardisation of gauge
- "Standard Railway Gauge". Townsville Bulletin. 5 October 1937. p. 12. Retrieved 19 March 2014 – via National Library of Australia.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> Roman gauge origin.