text:
Spacing of the rails on a railway track
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By transport mode
Tram · Rapid transit
Miniature · Scale model
By size (list)
Fifteen inch 381 mm (15 in)
Two foot
(1 ft 11+5⁄8 in)
(2 ft)
Bosnian gauge
Two foot six inch
(2 ft 5+1⁄2 in)
(2 ft 5+15⁄16 in)
(2 ft 6 in)
Swedish three foot
Three foot
Italian metre
(2 ft 11+3⁄32 in)
(3 ft1+13⁄32 in)
Metre 1,000 mm (3 ft 3+3⁄8 in)
Three foot six inch 1,067 mm (3 ft 6 in)
Four foot 1,219 mm (4 ft 0 in)
Four foot six inch 1,372 mm (4 ft 6 in)
1432 mm 1,432 mm (4 ft 8+3⁄8 in)
Standard 1,435 mm (4 ft 8+1⁄2 in)
Italian broad gauge
Dresden gauge
(4 ft 9+3⁄32 in)
Leipzig gauge 1,458 mm (4 ft 9+13⁄32 in)
Toronto gauge 1,495 mm (4 ft 10+7⁄8 in)
Five foot
(4 ft 11+27⁄32 in)
Pennsylvania gauge
Five foot three inch
Baltimore gauge 1,638 mm (5 ft 4+1⁄2 in)
Iberian gauge
Five foot six inch
Six foot 1,829 mm (6 ft)
Brunel 2,140 mm (7 ft 1⁄4 in)
Change of gauge
Break-of-gauge · Dual gauge ·
Conversion (list) · Bogie exchange · Variable gauge
North America · South America · Europe · Australia
Terminology (AU, NA, NZ, UK)
Variable gauge
Gauge conversion
Dual gauge
Railroad cars
Railway couplings
Couplers by country
Coupler conversion
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In rail transport, track gauge (in American English, alternatively track gage) is the distance between the two rails of a railway track. All vehicles on a rail network must have wheelsets that are compatible with the track gauge. Since many different track gauges exist worldwide, gauge differences often present a barrier to wider operation on railway networks.
The term derives from the metal bar, or gauge, that is used to ensure the distance between the rails is correct.
Railways also deploy two other gauges to ensure compliance with a required standard. A loading gauge is a two-dimensional profile that encompasses a cross-section of the track, a rail vehicle and a maximum-sized load: all rail vehicles and their loads must be contained in the corresponding envelope. A structure gauge specifies the outline into which structures (bridges, platforms, lineside equipment etc.) must not encroach.
Uses of the term
The most common use of the term "track gauge" refers to the transverse distance between the inside surfaces of the two load-bearing rails of a railway track, usually measured at 12.7 millimetres (0.50 inches) to 15.9 millimetres (0.63 inches) below the top of the rail head in order to clear worn corners and allow for rail heads having sloping sides.[1] The term derives from the "gauge", a metal bar with a precisely positioned lug at each end that track crews use to ensure the actual distance between the rails lies within tolerances of a prescribed standard: on curves, for example, the spacing is wider than normal.[2] Deriving from the name of the bar, the distance between these rails is also referred to as the track gauge.[3]
Selection of gauge
Early track gauges
The earliest form of railway was a wooden wagonway, along which single wagons were manhandled, almost always in or from a mine or quarry. Initially the wagons were guided by human muscle power; subsequently by various mechanical methods. Timber rails wore rapidly: later, flat cast-iron plates were provided to limit the wear. In some localities, the plates were made L-shaped, with the vertical part of the L guiding the wheels; this is generally referred to as a "plateway". Flanged wheels eventually became universal, and the spacing between the rails had to be compatible with that of the wagon wheels.[4]
As the guidance of the wagons was improved, short strings of wagons could be connected and pulled by teams of horses, and the track could be extended from the immediate vicinity of the mine or quarry, typically to a navigable waterway. The wagons were built to a consistent pattern and the track would be made to suit the needs of the horses and wagons: the gauge was more critical. The Penydarren Tramroad of 1802 in South Wales, a plateway, spaced these at 4 ft 4 in (1,321 mm) over the outside of the upstands.[5]
Fish-belly cast-iron rails from the Cromford and High Peak Railway
The Penydarren Tramroad probably carried the first journey by a locomotive, in 1804, and it was successful for the locomotive, but unsuccessful for the track: the plates were not strong enough to carry its weight. A considerable progressive step was made when cast iron edge rails were first employed; these had the major axis of the rail section configured vertically, giving a much stronger section to resist bending forces, and this was further improved when fish-belly rails were introduced.[6]
Edge rails required a close match between rail spacing and the configuration of the wheelsets, and the importance of the gauge was reinforced. Railways were still seen as local concerns: there was no appreciation of a future connection to other lines, and selection of the track gauge was still a pragmatic decision based on local requirements and prejudices, and probably determined by existing local designs of (road) vehicles.
Thus, the Monkland and Kirkintilloch Railway (1826) in the West of Scotland used 4 ft 6 in (1,372 mm);[7] the Dundee and Newtyle Railway (1831) in the north-east of Scotland adopted 4 ft 6+1⁄2 in (1,384 mm);[8] the Redruth and Chasewater Railway (1825) in Cornwall chose 4 ft (1,219 mm).[9]
The Arbroath and Forfar Railway opened in 1838 with a gauge of 5 ft 6 in (1,676 mm),[10] and the Ulster Railway of 1839 used 6 ft 2 in (1,880 mm).[10]
Standard gauge appears
An early Stephenson locomotive
Locomotives were being developed in the first decades of the 19th century; they took various forms, but George Stephenson developed a successful locomotive on the Killingworth Wagonway, where he worked. His designs were so successful that they became the standard, and when the Stockton and Darlington Railway was opened in 1825, it used his locomotives, with the same gauge as the Killingworth line, 4 ft 8 in (1,422 mm).[11][12]
The Stockton and Darlington line was immensely successful, and when the Liverpool and Manchester Railway, the first intercity line, was built (it opened in 1830), it used the same gauge. It was also hugely successful, and the gauge (now eased to 4 ft 8+1⁄2 in or 1,435 mm[11]), became the automatic choice: "standard gauge".
Gauge differences
The Liverpool and Manchester was quickly followed by other trunk railways, with the Grand Junction Railway and the London and Birmingham Railway forming a huge critical mass of standard gauge. When Bristol promoters planned a line from London, they employed the innovative engineer Isambard Kingdom Brunel. He decided on a wider gauge, to give greater stability, and the Great Western Railway adopted a gauge of 7 ft (2,134 mm), later eased to 7 ft 1⁄4 in (2,140 mm). This became known as broad gauge. The Great Western Railway (GWR) was successful and was greatly expanded, directly and through friendly associated companies, widening the scope of broad gauge.
At the same time, other parts of Britain built railways to standard gauge, and British technology was exported to European countries and parts of North America, also using standard gauge. Britain polarised into two areas: those that used broad gauge and those that used standard gauge. In this context, standard gauge was referred to as "narrow gauge" to indicate the contrast. Some smaller concerns selected other non-standard gauges: the Eastern Counties Railway adopted 5 ft (1,524 mm). Most of them converted to standard gauge at an early date, but the GWR's broad gauge continued to grow.
The larger railway companies wished to expand geographically, and large areas were considered to be under their control. When a new independent line was proposed to open up an unconnected area, the gauge was crucial in determining the allegiance that the line would adopt: if it was broad gauge, it must be friendly to the Great Western railway; if narrow (standard) gauge, it must favour the other companies. The battle to persuade or coerce that choice became very intense, and became referred to as "the gauge wars".
As passenger and freight transport between the two areas became increasingly important, the difficulty of moving from one gauge to the other—the break of gauge—became more prominent and more objectionable. In 1845 a Royal Commission on Railway Gauges was created to look into the growing problem, and this led to the Regulating the Gauge of Railways Act 1846,[13] which forbade the construction of broad gauge lines unconnected with the broad gauge network. The broad gauge network was eventually converted—a progressive process completed in 1892, called gauge conversion. The same Act mandated the gauge of 5 ft 3 in (1,600 mm) for use in Ireland.
Gauge selection in other countries
Map of the world's railways showing the different gauges in use. Black is standard gauge, red is Russian gauge, yellow is Indian gauge, orange is between Russian and Indian, blue and purple is narrow gauge. (See map inset for details.)
Triple gauge, from left: 1,435 mm (4 ft 8+1⁄2 in), 1,000 mm (3 ft 3+3⁄8 in), and 600 mm (1 ft 11+5⁄8 in), on display at the China Railway Museum in Beijing
As railways were built in other countries, the gauge selection was pragmatic: the track would have to fit the rolling stock. If locomotives were imported from elsewhere, especially in the early days, the track would be built to fit them. In some cases standard gauge was adopted, but many countries or companies chose a different gauge as their national gauge, either by governmental policy, or as a matter of individual choice.[14]
Standard gauge is generally known world-wide as being 1,435 mm (4 ft 8+1⁄2 in). Terms such as broad gauge and narrow gauge do not have any fixed meaning beyond being materially wider or narrower than standard.
In British practice, the space between the rails of a track is colloquially referred to as the "four-foot", and the space between two tracks the "six-foot", descriptions relating to the respective dimensions.
Standard gauge
In modern usage the term "standard gauge" refers to 1,435 mm (4 ft 8+1⁄2 in). Standard gauge is dominant in a majority of countries, including those in North America, most of western Europe, North Africa and the Middle east, and in China.
Broad gauge
In modern usage, the term "broad gauge" generally refers to track spaced significantly wider than 1,435 mm (4 ft 8+1⁄2 in).
Broad gauge is the dominant gauge in countries in Indian subcontinent, the former Soviet Union (CIS states, Baltic states, Georgia and Ukraine), Mongolia and Finland, Spain, Portugal, Argentina, Chile and Ireland. It is also use for the suburban railway systems in South Australia, and Victoria, Australia.
Medium gauge
The term "medium gauge" had different meanings throughout history, depending on the local dominant gauge in use.
In 1840s, the 1,600 mm (5 ft 3 in) Irish gauge was considered a medium gauge compared to Brunel's 7 ft 1⁄4 in (2,140 mm) broad gauge and the 1,435 mm (4 ft 8+1⁄2 in) narrow gauge, nowadays being standard gauge.[15]
In modern usage, the term "narrow gauge" generally refers to track spaced significantly narrower than 1,435 mm (4 ft 8+1⁄2 in).
Narrow gauge is the dominant or second dominant gauge in countries of Southern, Central Africa, East Africa, Southeast Asia, Japan, Taiwan, Philippines, Central America and South America,
During the period known as "the Battle of the gauges", Stephenson's standard gauge was commonly known as "narrow gauge", while Brunel's railway's 7 ft 1⁄4 in (2,140 mm) gauge was termed "broad gauge". Many narrow gauge railways were built in mountainous regions such as Wales, the Rocky Mountains of North America, Central Europe and South America. Industrial railways and mine railways across the world are often narrow gauge. Sugar cane and banana plantations are mostly served by narrow gauges.
Minimum-gauge
Very narrow gauges of under 2 feet (610 mm) were used for some industrial railways in space-restricted environments such as mines or farms. The French company Decauville developed 500 mm (19+3⁄4 in) and 400 mm (15+3⁄4 in) tracks, mainly for mines; Heywood developed 15 in (381 mm) gauge for estate railways. The most common minimum-gauges were 15 in (381 mm),[16] 400 mm (15+3⁄4 in), 16 in (406 mm), 18 in (457 mm), 500 mm (19+3⁄4 in) or 20 in (508 mm).
Break of gauge
A cartoon depicting the horrors of goods transfer at the break of gauge at Gloucester in 1843
Through operation between railway networks with different gauges was originally impossible; goods had to be transshipped and passengers had to change trains. This was obviously a major obstacle to convenient transport, and in Great Britain, led to political intervention.
On narrow gauge lines, Rollbocks or transporter wagons are used: standard gauge wagons are carried on narrow gauge lines on these special vehicles, generally with rails of the wider gauge to enable those vehicles to roll on and off at transfer points.
On the Transmongolian Railway, Russia and Mongolia use 1,520 mm (4 ft 11+27⁄32 in) while China uses the standard gauge of 1,435 mm. At the border, each carriage is lifted and its bogies are changed. The operation can take several hours for a whole train of many carriages.
Other examples include crossings into or out of the former Soviet Union: Ukraine/Slovakia border on the Bratislava–L'viv train, and the Romania/Moldova border on the Chișinău-Bucharest train.[17]
A system developed by Talgo and Construcciones y Auxiliar de Ferrocarriles (CAF) of Spain uses variable gauge wheelsets; at the border between France and Spain, through passenger trains are drawn slowly through apparatus that alters the gauge of the wheels, which slide laterally on the axles.[18]
A similar system is used between China and Central Asia, and between Poland and Ukraine, using the SUW 2000 and INTERGAUGE variable axle systems.[19] China and Poland use standard gauge, while Central Asia and Ukraine use 1,520 mm (4 ft 11+27⁄32 in).
Cross-section of triple-gauge track at Gladstone and Peterborough, South Australia, before gauge standardisation in 1970 (click to enlarge)
Mixed gauge track at Sassari, Sardinia: 1,435 mm (4 ft 8+1⁄2 in) standard gauge and 950 mm (3 ft 1+3⁄8 in)
When individual railway companies have chosen different gauges and have needed to share a route where space on the ground is limited, mixed gauge (or dual gauge) track, in which three (sometimes four) rails are supported in the same track structure, can be necessary. The most frequent need for such track was at the approaches to city terminals or at break-of-gauge stations.
Tracks of multiple gauges involve considerable costs in construction (including signalling work) and complexities in track maintenance, and may require some speed restrictions. They are therefore built only when absolutely necessary. If the difference between the two gauges is large enough – for example between 1,435 mm (4 ft 8+1⁄2 in) standard gauge and 3 ft 6 in (1,067 mm) – three-rail dual-gauge is possible, but if not – for example between 3 ft 6 in (1,067 mm) and 1,000 mm (3 ft 3+3⁄8 in) metre gauge – four rails must be used. Dual-gauge rail lines occur (or have occurred) in Argentina, Australia, Brazil, Japan, North Korea, Spain, Switzerland, Tunisia and Vietnam.
Reconstructed mixed-gauge, 1,435 mm (4 ft 8+1⁄2 in) standard gauge / 7 ft 1⁄4 in (2,140 mm) track at Didcot Railway Museum, England
On the GWR, there was an extended period between political intervention in 1846 that prevented major expansion of its 7 ft 1⁄4 in (2,140 mm) broad gauge[note 1] and the final gauge conversion to standard gauge in 1892. During this period, many locations practicality required mixed gauge operation, and in station areas the track configuration was extremely complex. This was compounded by the common rail having to be at the platform side in stations; therefore, in many cases, standard-gauge trains needed to be switched from one side of the track to the other at the approach. A special fixed point arrangement was devised for the purpose, where the track layout was simple enough.[note 2]
In some cases, mixed gauge trains were operated with wagons of both gauges. For example, MacDermot[20] wrote:
In November 1871 a novelty in the shape of a mixed-gauge goods train was introduced between Truro and Penzance. It was worked by a narrow-gauge engine, and behind the narrow-gauge trucks came a broad-gauge match-truck with wide buffers and sliding shackles, followed by the broad-gauge trucks. Such trains continued to run in West Cornwall until the abolition of the Broad Gauge; they had to stop or come down to walking pace at all stations where fixed points existed and the narrow portion side-stepped to right or left.
Nominal track gauge
The nominal track gauge is the distance between the inner faces of the rails. In current practice, it is specified at a certain distance below the rail head as the inner faces of the rail head (the gauge faces) are not necessarily vertical. Some amount of tolerance is necessarily allowed from the nominal gauge to allow for wear, etc.; this tolerance is typically greater for track limited to slower speeds, and tighter for track where higher speeds are expected (as an example, in the US the gauge is allowed to vary between 4 ft 8 in (1,420 mm) to 4 ft 10 in (1,470 mm) for track limited to 10 mph (16 km/h), while 70 mph (110 km/h) track is allowed only 4 ft 8 in (1,420 mm) to 4 ft 9+1⁄2 in (1,460 mm). Given the allowed tolerance, it is a common practice to widen the gauge slightly in curves, particularly those of shorter radius (which are inherently slower speed curves).
Rolling stock on the network must have running gear (wheelsets) that are compatible with the gauge, and therefore the gauge is a key parameter in determining interoperability, but there are many others – see below. In some cases in the earliest days of railways, the railway company saw itself as an infrastructure provider only, and independent hauliers provided wagons suited to the gauge. Colloquially the wagons might be referred to as "four-foot gauge wagons", say, if the track had a gauge of four feet. This nominal value does not equate to the flange spacing, as some freedom is allowed for.
An infrastructure manager might specify new or replacement track components at a slight variation from the nominal gauge for pragmatic reasons.
The gauge is defined in Imperial units, metric units or SI units.
Imperial units were established in the United Kingdom by The Weights and Measures Act of 1824. The United States customary units for length did not agree with the Imperial system until 1959, when one international yard was defined as 0.9144 meters and, as derived units, 1 foot (=1⁄3 yd) as 0.3048 meter and 1 inch (=1⁄36 yd) as 25.4 mm.
The list shows the Imperial and other units that have been used for track gauge definitions:
SI equivalent
Track gauge example
Imperial foot 304.8 mm
Castilian foot[citation needed] 278.6 mm
6 Castilian feet = 1,672 mm (5 ft 5+13⁄16 in)
2 Castilian feet 558 mm (1 ft 9+31⁄32 in)
Portuguese foot 332.8 mm 5 Portuguese feet = 1,664 mm (5 ft 5+1⁄2 in)
Swedish foot 296.904 mm
3 Swedish feet = 891 mm (2 ft 11+3⁄32 in)
2.7 Swedish feet = 802 mm (2 ft 7+9⁄16 in)
Prussian foot (Rheinfuß) 313.85 mm 2+1⁄2 Prussian feet = 785 mm (2 ft 6+29⁄32 in)
Austrian fathom[citation needed] 1520 mm 1⁄2 Austrian fathom = 760 mm (2 ft 5+15⁄16 in)
Temporary way – permanent way
Narrow gauge work train in an East Side Access cavern where standard gauge station for the Long Island Rail Road is nearing completion.
A temporary way is the temporary track often used for construction, to be replaced by the permanent way (the structure consisting of the rails, fasteners, sleepers/ties and ballast (or slab track), plus the underlying subgrade) when construction nears completion. In many cases narrow-gauge track is used for a temporary way because of the convenience in laying it and changing its location over unimproved ground.
In restricted spaces such as tunnels, the temporary way might be double track even though the tunnel will ultimately be single track. The Airport Rail Link in Sydney had construction trains of 900 mm (2 ft 11+7⁄16 in) gauge, which were replaced by permanent tracks of 1,435 mm (4 ft 8+1⁄2 in) gauge.
During World War I trench warfare led to a relatively static disposition of infantry, requiring considerable logistics to bring them support staff and supplies (food, ammunition, earthworks materials, etc.). Dense light railway networks using temporary narrow gauge track sections were established by both sides for this purpose.[21]
In 1939 it was proposed to construct the western section of the Yunnan–Burma Railway using a gauge of 15+1⁄4 in (387 mm), since such tiny or "toy" gauge facilitates the tightest of curves in difficult terrain.[22]
Maintenance standards
Track maintenance workers checking the gauge at Plymouth, England
Infrastructure owners specify permitted variances from the nominal gauge, and the required interventions when non-compliant gauge is detected. For example, the Federal Railroad Administration in the USA specifies that the actual gauge of a 1,435 mm track that is rated for a maximum of 60 mph (96.6 km/h) must be between 4 ft 8 in (1,422 mm) and 4 ft 9.5 in (1,460 mm).[23]
Advantages and disadvantages of different track gauges
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Speed, capacity, and economy are generally objectives of rail transport, but there is often an inverse relationship between these priorities. There is a common misconception that a narrower gauge permits a tighter turning radius, but for practical purposes, there is no meaningful relationship between gauge and curvature.[24][25]
Construction cost
Narrower gauge railways usually cost less to build because they are usually lighter in construction, using smaller cars and locomotives (smaller loading gauge), as well as smaller bridges, smaller tunnels (smaller structure gauge).[26] Narrow gauge is thus often used in mountainous terrain, where the savings in civil engineering work can be substantial. It is also used in sparsely populated areas, with low potential demand, and for temporary railways that will be removed after short-term use, such as for construction, the logging industry, the mining industry, or large-scale construction projects, especially in confined spaces (see Temporary way – permanent way). For temporary railways which will be removed after short-term use, such as those used in logging, mining or large-scale construction projects (especially in confined spaces, such as when constructing the Channel Tunnel), a narrow-gauge railway is substantially cheaper and easier to install and remove. Such railways have almost vanished, however, due to the capabilities of modern trucks. In many countries, narrow-gauge railways were built as branch lines to feed traffic to standard-gauge lines due to lower construction costs. The choice was often not between a narrow- and standard-gauge railway, but between a narrow-gauge railway and none at all.
Broader gauge railways are generally more expensive to build, because they are usually heavier in construction, use larger cars and locomotives (larger loading gauge), as well as larger bridges, larger tunnels (larger structure gauge). But broader gauges offer higher speed and capacity. For routes with high traffic, greater capacity may more than offset the higher initial cost of construction.
The value or utility a user derives from a good or service depends on the number of users of compatible products – the "network effect" in economics. Network effects are typically positive, resulting in a given user deriving more value from a product as other users join the same network.[27] At national levels, the network effect has resulted in commerce extending beyond regional and national boundaries. Increasingly, many governments and companies have made their railways' engineering and operational standards compatible in order to achieve interchangeability – hence faster, longer-distance train operation. A major barrier to achieving interchangeability, however, is path dependence[28] – in this context the persistence of an already adopted standard to which equipment, infrastructure and training has become aligned. Since adopting a new standard is difficult and expensive, continuing with an existing standard can remain attractive unless longer-term benefits are given appropriate weight. An example of the consequences of path dependence is the persistence in the United Kingdom – the earliest nation to develop and adopt railway technologies – of structure gauges that are too small to allow the larger rolling stock of continental Europe to operate in that country. The reduced cost, greater efficiency, and greater economic opportunity offered by the use of a common standard has resulted in the historical multitude of track gauges dwindling to a small number that predominate worldwide.
When interchangeability has not been achieved, freight and passengers must be transferred through time-consuming procedures requiring manual labour and substantial capital expenditure.[29] Some bulk commodities, such as coal, ore, and gravel, can be mechanically transshipped, but even this is time-consuming, and the equipment required for the transfer is often complex to maintain. Further, if rail lines of different gauges coexist in a network and a break of gauge exists, it is difficult in times of peak demand to move rolling stock to where it is needed. Sufficient rolling stock must be available to meet a narrow-gauge railway's peak demand (which might be greater in comparison to a broader-gauge network), and the surplus equipment generates no cash flow during periods of low demand. In regions where narrow-gauge lines form a small part of the rail network (as was the case on Russia's Sakhalin Railway), extra cost is involved in designing, manufacturing or importing narrow-gauge equipment.
Solutions to interchangeability problems include bogie exchanges, a rollbock system, dual gauge, variable gauge, or gauge conversion.
Dominant railway gauges
More than half of the world's railways are built to 1,435 mm (4 ft 8+1⁄2 in) standard gauge.[when?][citation needed] New railways have been built in Africa to standard gauge. Most of the narrow-gauge railways in India are being converted to the dominant, broad-gauge.[30]
in km
in miles
% world
1,000 mm (3 ft 3+3⁄8 in) Metre gauge 95,000 59,000 7.2% Argentina (11,000 km or 6,800 mi), Brazil (23,489 km or 14,595 mi), Bolivia, northern Chile, Greece (in the disused Peloponnese network), Spain (Feve, FGC, Euskotren, FGV, SFM), Switzerland (RhB, MOB, BOB, MGB), Malaysia, Thailand, Cambodia, Bangladesh, East Africa, Vietnam
1,067 mm (3 ft 6 in) Three foot six inch gauge 112,000 70,000 8.5% Southern and Central Africa; Nigeria (most); Indonesia (Java and Sumatera) ; Japan; Taiwan; Philippines; New Zealand; and the Australian states of Queensland, Western Australia, Tasmania and South Australia.
1,435 mm (4 ft 8+1⁄2 in) Standard gauge 720,000 450,000 54.9% Albania, Argentina, Australia, Austria, Belgium, Bosnia and Herzegovina, Brazil (194 km or 121 mi), Bulgaria, Canada, China, Croatia, Cuba, Czech Republic, Denmark, Djibouti, DR Congo (Kamina-Lubumbashi section, planned), Ethiopia, France, Germany, Great Britain (United Kingdom), Greece, Hong Kong, Hungary, India (only used in rapid transit), Indonesia (Aceh, LRT Jabodetabek, LRT Jakarta, MRT Jakarta East - West Line Corridor, High-Speed rail in Indonesia, and Sulawesi), Italy, Israel, Kenya (Mombasa–Nairobi Standard Gauge Railway), Laos, Liechtenstein, Lithuania (Rail Baltica), Luxembourg, Macedonia, Mexico, Montenegro, Netherlands, North Korea, Norway, Panama, Peru, Philippines, Poland, Romania, Serbia, Singapore MRT, Slovakia, Slovenia, South Korea, Spain (AVE, Alvia and FGC), Sweden, Switzerland, Turkey, United States, Uruguay, Venezuela, north Vietnam. Also private companies' lines and JR high-speed lines in Japan. High-speed lines in Taiwan. Gautrain commuter system in South Africa. New lines in Tanzania and Nigeria.
1,520 mm (4 ft 11+27⁄32 in) Five foot and 1520 mm gauge 220,000 140,000 16.8% Armenia, Azerbaijan, Belarus, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Mongolia, Russia, Tajikistan, Turkmenistan, Ukraine, Uzbekistan.
(all contiguous – redefined from 1,524 mm (5 ft))
1,524 mm (5 ft) 7,065 4,390 0.5% Estonia,[31] Finland
(contiguous, and generally compatible, except high speed trains, with 1,520 mm (4 ft 11+27⁄32 in)
1,600 mm (5 ft 3 in) Five foot three inch gauge 9,800 6,100 0.7% Ireland, Northern Ireland (United Kingdom) (1,800 km or 1,100 mi), and in the Australian states of Victoria and South Australia (4,017 km or 2,496 mi), Brazil (4,057 km or 2,521 mi)[when?]
1,668 mm (5 ft 5+21⁄32 in) Iberian gauge 15,394 9,565 1.2% Portugal, Spain. Sometimes referred to as Iberian gauge. In Spain the Administrador de Infraestructuras Ferroviarias (ADIF) managed 11,683 km (7,259 mi) of this gauge and 22 km (14 mi) of mixed gauge at end of 2010.[32] The Portuguese Rede Ferroviária Nacional (REFER) managed 2,650 km (1,650 mi) of this gauge of this track at the same date.[32]
1,676 mm (5 ft 6 in) Five foot six inch gauge 134,008 83,269 10.2% India, Pakistan, Bangladesh, Sri Lanka, Argentina, Chile, BART in the United States San Francisco Bay Area
Total for each group of gauges in 2020:[citation needed]
Installation (km)
Installation (mi)
Percentage (2020)
Narrow gauge(s) 233,391 145,022 17.5% 15.8%
Standard gauge 807,616 501,829 60.6% 54.9%
Broad gauge(s) 290,705 180,636 21.8% 29.3%
Totals 1,331,712 827,487 100% 100%
Further convergence of rail gauge use seems likely, as countries seek to build inter-operable networks, and international organisations seek to build macro-regional and continental networks. Almost all new high-speed rail lines are built to standard gauge, except in Uzbekistan and Russia.
The European Union has set out to develop inter-operable freight and passenger rail networks across its area, and is seeking to standardise gauge, signalling and electrical power systems. EU funds have been dedicated to assist Lithuania, Latvia, and Estonia in the building of some key railway lines (Rail Baltica) of standard gauge, and to assist Spain and Portugal in the construction of high-speed lines to connect Iberian cities to one another and to the French high-speed lines. The EU has developed plans for improved freight rail links between Spain, Portugal, and the rest of Europe.
Trans-Asian Railway
The United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP) is planning a Trans-Asian Railway that will link Europe and the Pacific, with a Northern Corridor from Europe to the Korean Peninsula, a Southern Corridor from Europe to Southeast Asia, and a North–South corridor from Northern Europe to the Persian Gulf. All these would encounter breaks of gauge as they cross Asia. Current plans have mechanized facilities at the breaks of gauge to move containers from train to train rather than widespread gauge conversion. The Northern Corridor through Russia already operates since before year 2000, with increasing volumes China–Europe.
2008: Proposed link between Venezuela and Colombia[33]
2008: Venezuela via Brazil to Argentina – standard gauge[34]
2008: A proposed metre gauge line across Southern Paraguay to link Argentina at Resistencia to Brazil at Cascavel; both those lines are 1,000 mm (3 ft 3+3⁄8 in) metre gauge, and the new line would allow "bioceanic" running from the Atlantic port of Paranaguá in Brazil to that of Antofagasta in Chile on the Pacific.
The East African Railway Master Plan is a proposal for rebuilding and expanding railway lines connecting Ethiopia, Djibouti, Kenya, Uganda, Rwanda, Burundi, Tanzania, South Sudan and beyond.[35] The plan is managed by infrastructure ministers from participating East African Community countries in association with transport consultation firm CPCS Transcom.[36] Older railways are of 1,000 mm (3 ft 3+3⁄8 in) metre gauge or 3 ft 6 in (1,067 mm) gauge. Newly rebuilt lines will use standard gauge. Regular freight and passenger services began on the standard gauge Mombasa–Nairobi railway in 2017 and on the standard gauge Addis Ababa–Djibouti railway in 2018.
Lines for iron ore to Kribi in Cameroon are likely to be 1,435 mm (4 ft 8+1⁄2 in) standard gauge with a likely connection to the same port from the 1,000 mm (3 ft 3+3⁄8 in) metre gauge Cameroon system.
Nigeria's railways are mostly 3 ft 6 in (1,067 mm) Cape gauge. The Lagos–Kano Standard Gauge Railway is a gauge conversion project by the Nigerian Government to create a north–south standard gauge rail link. The first converted segment, between Abuja and Kaduna, was completed in July 2016.
The African Union has a 50-year plan to connect the capital cities and major centres by high-speed railways.
Chosen by
4 ft 8+1⁄2 in (1,435 mm) 1825 George Stephenson
5 ft (1,524 mm) 1827 Horatio Allen for the South Carolina Canal and Rail Road Company
1 ft 11+1⁄2 in (597 mm) 1836 Henry Archer for the Festiniog Railway to easily navigate mountainous terrain
(Britain's first steam-hauled narrow gauge passenger service in 1865) (originally horse-drawn)
7 ft 1⁄4 in (2,140 mm) 1838 I. K. Brunel
5 ft (1,524 mm) 1842 George Washington Whistler for the Moscow – Saint Petersburg Railway based on Southern US practice
5 ft 3 in (1,600 mm) 1846 chosen in Ireland as a compromise
5 ft 6 in (1,676 mm) 1853 Lord Dalhousie in India following Scottish practice
3 ft 6 in (1,067 mm) 1862 Carl Pihl for the Røros Line in Norway to reduce costs
3 ft 6 in (1,067 mm) 1865 Abraham Fitzgibbon for the Queensland Railways to reduce costs
3 ft (914 mm) 1870 William Jackson Palmer for the Denver & Rio Grande Railway to reduce costs (inspired by the Festiniog Railway)
2 ft (610 mm) 1877 George E. Mansfield for the Billerica and Bedford Railroad to reduce costs (inspired by the Festiniog Railway)
2 ft 6 in (762 mm) 1887 Everard Calthrop to reduce costs; had designs for a matching fleet of rolling stock
List of track gauges
Rapid transit track gauge
List of tram systems by gauge and electrification
Loading gauge
Minimum railway curve radius
Overhead line
Rail profile
Rail terminology
Rail transport modelling scales
Railway coupling
Structure gauge
Track gauge conversion
^ The Act of Parliament did not prohibit expansion of the existing broad gauge system, but it had the indirect and delayed effect of forcing conformity with the "standard" gauge eventually.
^ S.C. Jenkins and R.C. Langley, The West Cornwall Railway, The Oakwood Press, Usk, 2002, ISBN 0853615896, gives an illustration and description on page 66.
^ Tratman, E.E. Russell (1908). Railway track and track work (3rd ed.). New York: The Engineering News Publishing Co. p. 383.
^ Wilson, John (2021). The train to Oodna-Woop-Woop: a social history of the Afghan Express. Banksia Park, South Australia: Sarlines Railway Books. p. 31. ISBN 9780646842844.
^ "Section 12.2". Track Maintenance Guide. Adelaide: Australian National [Railways Commission]. 1988.
^ M. J. T. Lewis (1970), Early Wooden Railways, Routledge Keegan Paul, London
^ R. Cragg (1997), Civil Engineering Heritage – Wales and West Central, Thomas Telford Publishing, London, 2nd edition, England, ISBN 0 7277 2576 9
^ Andy Guy and Jim Rees, Early Railways 1569–1830, Shire Publications in association with the National Railway Museum, Oxford, 2011, ISBN 978 0 74780 811 4
^ Don Martin, The Monkland and Kirkintilloch and Associated Railways, Strathkelvin Public Libraries, Kirkintilloch, 1995, ISBN 0 904966 41 0
^ N. Ferguson (1995), The Dundee and Newtyle Railway including the Alyth and Blairgowrie Branches, The Oakwood Press, ISBN 0-85361-476-8.
^ D. B. Barton (1966), The Redruth and Chasewater Railway, 1824–1915, D. Bradford Barton Ltd, Truro, 2nd edition
^ a b Francis Whishaw, The Railways of Great Britain and Ireland Practically Described and Illustrated, 1842, reprint 1969, David & Charles (Publishers) Limited, Newton Abbot, ISBN 0-7153-4786-1
^ a b W W Tomlinson, The North Eastern Railway, its Rise and Development, Andrew Reid & Co, Newcastle upon Tyne, 1915
^ Nicholas Wood, A Practical Treatise on Rail-Roads, Longman, Orme, Brown, Green and Longmans, London, Third edition, 1838
^ "An Act for regulating the Gauge of Railways" (PDF). 18 October 1846. Retrieved 26 April 2010.
^ The Russian Railways and Imperial Intersections in the Russian Empire, Karl E. M. Starns, Thesis, University of Washington 2012, p. 33
^ "The beginning of the Great Southern and Western Railway".
^ Heywood, A.P. (1974) [1881, Derby: Bemrose]. Minimum Gauge Railways. Turntable Enterprises. ISBN 0-902844-26-1.
^ "Beyond Thunderdome: Iron Curtain 2k6". Archived from the original on 8 July 2011. Retrieved 10 October 2007.
^ Alberto García Álvarez, Automatic Gauge Changeover for Trains in Spain, Fundación de los Ferrocarrilos Españoles, 2010, online at [1]
^ Experience and results of operation the SUW 2000 system in traffic corridors at "Archived copy" (PDF). Archived from the original (PDF) on 19 March 2009. Retrieved 7 December 2008. {{cite web}}: CS1 maint: archived copy as title (link)
^ E T MacDermot, History of the Great Western Railway, vol II: 1863–1921, published by the Great Western Railway, London, 1931, p. 316
^ Christian Wolmar, Engines of War: How Wars Were Won & Lost on the Railways, Atlantic Books, London, 2010, ISBN 978-1848871724
^ "TOY RAILWAY". The Northern Standard. Darwin, NT: National Library of Australia. 8 December 1939. p. 15. Retrieved 5 December 2011.
^ "Track Safety Standards Compliance Manual Chapter 5 Track Safety Standards Classes 1 through 5" (PDF). Federal Railroad Administration. Archived from the original (PDF) on 28 May 2008. Retrieved 26 February 2010.
^ Wellington, Arthur (1910). The Economic Theory of the Location of Railways. New York: John Wiley & Sons. pp. 751–754.
^ Siddall, William (January 1969). "Railroad Gauges and Spatial Interaction". Geographical Review. American Geographical Society. 59 (1): 36. doi:10.2307/213081. JSTOR 213081.
^ Spooner, Charles Easton (1879). Narrow Gauge Railways. p. 71.
^ Shapiro, Carl. (1999). Information rules : a strategic guide to the network economy. Varian, Hal R. Boston, Mass.: Harvard Business School Press. ISBN 0-87584-863-X. OCLC 39210116.
^ Liebowitz, S.; Margolis, Stephen (2000). Encyclopedia of Law and Economics. p. 981. ISBN 978-1-85898-984-6.
^ Irish Railways including Light Railways (Vice-Regal Commission. Vol. XLVII. London): House of Commons. 1908. p. 200.
^ "Indian Railways: Battle of the Gauges". 22 April 2021.
^ Estonian railways today Archived March 3, 2016, at the Wayback Machine, p. 32
^ a b Karl Arne Richter (editor), Europäische Bahnen '11, Eurailpress, Hamburg, 2010, ISBN 978-3-7771-0413-3
^ "Colombia and Venezuela to build railroad".
^ "Venezuela, Argentina begin construction of railway linking their capitals". China Daily. Xinhua. 21 August 2008. Archived from the original on 4 March 2009. Retrieved 21 August 2008.
^ Sambu, Zeddy (29 April 2008). "East Africa: Countries Move to Upgrade Railway Network". Business Daily (South Africa). Archived from the original on 14 May 2014. Retrieved 13 May 2014.
^ Muramira, Gashegu (20 April 2009). "East Africa: EAC Railway Master Plan to Be Redesigned". New Times (Rwanda). Retrieved 13 May 2014.
Wikimedia Commons has media related to Track gauge.
track gauge (P1064) (see uses)
OpenRailwayMap. A global track gauge map
A history of track gauge by George W. Hilton
"Railroad Gauge Width". Archived from the original on 17 July 2012. – A list of railway gauges used or being used worldwide, including gauges that are obsolete.
European Railway Agency: 1520 mm systems[permanent dead link] (issues with the participation of 1520/1524 mm gauge countries in the EU rail network)
The Days they Changed the Gauge in the U.S. South
Juan Manuel Grijalvo – The Myth of the "Standard" Gauge
Track gauge (list)
Minimum-gauge railways
400 mm (15+3⁄4 in)
1 ft 10 in (559 mm)
2 foot and 600 mm
750 mm (2 ft 5+1⁄2 in)
760 mm (2 ft 5+15⁄16 in)
2 ft 6 in (762 mm)
891 mm (2 ft 11+3⁄32 in) Swedish three foot
900 mm (2 ft 11+7⁄16 in)
3 ft (914 mm)
950 mm (3 ft 1+3⁄8 in) Italian metre gauge
1,000 mm (3 ft 3+3⁄8 in) metre gauge
1,050 mm (3 ft 5+11⁄32 in),
1,055 mm (3 ft 5+1⁄2 in),
3 ft 6 in (1,067 mm)
1,093 mm (3 ft 7 in),
1,100 mm (3 ft 7+5⁄16 in),
1,200 mm (3 ft 11+1⁄4 in)
4 ft (1,219 mm)
4 ft 1 in (1,245 mm), Middleton Railway
4 ft 6 in (1,372 mm), Scotch gauge
4 ft 6+1⁄2 in (1,384 mm), Scotch gauge
4 ft 7+3⁄4 in (1,416 mm)
4 ft 8 in (1,422 mm), almost standard gauge
1,432 mm (4 ft 8+3⁄8 in)
4 ft 8+1⁄2 in / 1,435 mm, Stephenson gauge
1,440 mm (4 ft 8+11⁄16 in)
1,450 mm (4 ft 9+3⁄32 in)
4 ft 10+7⁄8 in (1,495 mm), Toronto gauge
5 ft / 1,524 mm and 1,520 mm (4 ft 11+27⁄32 in), Russian gauge.
5 ft 2+1⁄4 in / 1,581 mm and 5 ft 2+1⁄2 in / 1,588 mm, Pennsylvania gauge
5 ft 3 in (1,600 mm), Irish gauge
5 ft 4+1⁄2 in (1,638 mm), Baltimore gauge
1,668 mm (5 ft 5+21⁄32 in), Iberian gauge
5 ft 6 in (1,676 mm), Indian gauge
7 ft 1⁄4 in (2,140 mm), Brunel gauge
3,000 mm (9 ft 10+1⁄8 in), Breitspurbahn
8,200 mm (26 ft 10+27⁄32 in), Lärchwandschrägaufzug
9,000 mm (29 ft 6+5⁄16 in), Krasnoyarsk ship lift
List of track gauge articles
List of tram track gauges
Miniature railways
Large amusement railways
Bogie exchange
Tram and light rail
by imperial units
by metric units
lists of track gauges
Tracks (history)
Axe ties
Baulk road
Breather switch
Clip and scotch
Date nail
Fastening system
Fishplate
Ladder track
Minimum radius
Tie/Sleeper
Transition curve
Trackwork
Balloon loop
Classification yard
Headshunt
Pocket track
Gauntlet track
Passing loop
Rail track
tramway track
Railway electrification system
overhead lines
ground-level power supply
Railway turntable
Transfer table (traverser)
Roll way
refuge siding
Track geometry
Water crane
Water trough
and safety
Block post
Buffer stop
Catch points
Defect detector
Derailer
Platform screen doors
Railway signal
Signalling control
Signal bridge
Tell-tale
Train stop
Wayside horn
Coaling tower
Motive power depot/Railway workshop
for trains
for goods
Water stop
Railway track layouts
Quadruple track
Rail sidings
Flying junction
Level junction
Double junction
Facing and trailing
Grand union
Grand circle / roundabout
Switch / turnout / points
Swingnose crossing
Railway platform
Terminal station
Spanish solution
Cross-platform interchange
Interchange station
Infill station
Hillclimbing
Horseshoe curve
Zig Zag / Switchback
Ruling gradient
Minimum curve radius
Cant deficiency
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