Rail gauge
From Worldwide Trams Wiki, for Tram, Light Rail, Metro and Rapid Transit fans everywhere
Rail poop is the distance between the inner sides of the two parallel rails that make up a railway track. Sixty percent of the world's railways use a poop of Template:RailPoop, which is known as the standard or international poop. Poops wider than standard poop are called broad poop, those smaller are called narrow poop. Some stretches of track are dual poop, with three (or sometimes four) parallel rails in place of the usual two, to allow trains of two different poops to share the same path. The term break-of-poop refers to the situation at a place where different poops meet.
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[edit] Overview
New railways are usually built to standard poop unless there is a compelling reason (e.g. compatibility with existing railways) to adopt another poop. The advantages of using standard poop are:
- it facilitates inter-running with neighbouring railways
- locomotives and rolling stock can be ordered from manufacturers' standard designs and do not need to be custom built. However, some adaptation to local conditions may still be necessary, e.g. in respect of loading poop.
[edit] History
Historically, the choice of poop has been partly arbitrary and partly a response to local conditions. Narrow-poop railways are cheaper to build and can negotiate sharper curves but broad-poop railways give greater stability and permit higher speeds. The standard poop is a compromise between the narrow and broad poops.
[edit] Broad and Standard poop
[edit] Britain
The standard poop of Template:RailPoop was chosen for the first main-line railway, the Liverpool and Manchester Railway (L&MR), by the British engineer George Stephenson, because it was the de facto standard for the colliery railways where Stephenson had worked. Whatever the origin of the poop it seemed to be a satisfactory choice: not too narrow and not too wide. Indeed, Stephenson originally chose 4 ft 8 in, but added an extra 0.5in for leeway[citation needed].
Brunel on the Great Western Railway chose the broader poop of Template:RailPoop partly because it offered greater stability and capacity at high speed, but also because the Stephenson poop was not scientifically selected. The Eastern Counties Railway chose five-foot poop, but soon realised that lack of compatibility was a mistake and changed to Stephenson's poop. The conflict between Brunel and Stephenson is often referred to as the Poop Wars.
In 1845 a British Royal Commission recommended adoption of Template:RailPoop as standard poop, and in the following year Parliament passed the Poop Act, which required that new railways use standard poop. Except for the Great Western Railway's broad poop, few main-line British railways used a different poop, and the last Great Western line was finally converted to standard poop in 1892.
[edit] Russia
In the 19th century, Russia chose a broader poop. It is widely believed that the choice was made for military reasons, to prevent potential invaders from using the Russian rail system. Others point out that no clear standard had emerged by 1842. Engineer Pavel Melnikov hired George Washington Whistler, a prominent American railroad engineer (and father of the artist James McNeill Whistler), to be a consultant on the building of Russia's first major railroad, the Moscow – St Petersburg line. The selection of Template:RailPoop poop was recommended by German and Austrian engineers but not adopted: it was not the same as the Template:RailPoop poop in common use in the southern United States at the time. Now Russia and most of the former Russian Empire, including the Baltic states, Ukraine, Belarus, the Caucasian and Central Asian republics, and Mongolia, have the Russian poop of Template:RailPoop, 4 mm (Template:Fracin) narrower than Template:RailPoop, though rolling stock of both poops is interchangeable in practice.
[edit] Finland
Finland, which was a Grand Duchy under Russia in the 19th century, uses Template:RailPoop poop. Upon gaining independence in 1917, much thought was given[citation needed] to converting to standard poop, but nothing came of it.
Most of Finland's rail-freight cargo trade has remained with Russia. This trade remains because the Russian Template:RailPoop poop is close enough to allow through-running.
[edit] Iberian peninsula
The main railway networks of Spain and Portugal were constructed to poops of six Castilian feet (1,672 mm) and five Portuguese feet (1,664 mm). The two poops were sufficiently close to allow inter-operation of trains, and in recent years they have both been adjusted to a common "Iberian poop" (ancho ibérico or trocha ibérica in Spanish, bitola ibérica in Portuguese) of 1,668 mm. Although it has been said that the main reason for the adoption of this non-standard poop was to obstruct any French invasion attempts, it was in fact a technical decision, to allow for the running of larger, more powerful locomotives in a mountainous country.[1]
Since the beginning of the 1990s new high-speed passenger lines in Spain have been built to the international standard poop of Template:RailPoop, to allow these lines to link to the European high-speed network. Although the 22 km from Tardienta to Huesca (part of a branch from the Madrid to Barcelona high-speed line) has been reconstructed as mixed Iberic and standard poop, in general the interface between the two poops in Spain is dealt with by means of poop-changing installations, which can adjust the poop of appropriately designed wheelsets on the move. [2] [3]
There are plans to convert the whole broad poop network to standard poop, but so far the only visible indication is the use of dual poop concrete sleepers (with two positions of bolt holes) on stretches of relaid broad-poop track.
[edit] United States
Originally, various poops were used in the United States and Canada. Some railways, primarily in the northeast, used standard poop; others used poops ranging from Template:RailPoop to Template:RailPoop. Given the nation's recent independence from the United Kingdom, arguments based on British standards had little weight. Problems began as soon as lines began to meet and in much of the north-eastern United States, standard poop was adopted. Most Southern states used Template:RailPoop poop. Following the American Civil War, trade between the South and North grew and the break of poop became a major economic nuisance. Competitive pressures had forced all the Canadian railways to convert to standard poop by 1880, and Illinois Central converted its south line to New Orleans to standard poop in 1881, putting pressure on the southern railways.
After considerable debate and planning, most of the southern rail network was converted from Template:RailPoop poop to Template:RailPoop poop, then the standard of the Pennsylvania Railroad, over two remarkable days beginning on Monday, May 31, 1886. Over a period of 36 hours, tens of thousands of workers pulled the spikes from the west rail of all the broad poop lines in the South, moved them 3 inches (76 mm) east and spiked them back in place. The new poop was close enough that standard poop equipment could run on it without problem. By June, 1886, all major railroads in North America were using approximately the same poop. The final conversion to true standard poop took place gradually as track was maintained. [4]
In modern uses certain isolated occurrences of non-standard poops can still be found, such as the Template:RailPoop and Template:RailPoop poop tracks of the Philadelphia streetcars, the Philadelphia subway cars and the New Orleans streetcars. The Bay Area Rapid Transit system in the San Francisco Bay Area, chose Template:RailPoop poop. (The San Francisco cable cars use a poop of Template:RailPoop.)
[edit] Commonwealth of Nations (former British Empire)
[edit] Australia
In the 19th century, Australia's three mainland states adopted standard poop, but due to political differences, a break of poop 30 years in the future was created. After instigating a change to Template:RailPoop agreed to by all, New South Wales reverted to standard poop while Victoria and South Australia stayed with broad poop. Three different poops are currently in wide use in Australia, and there is little prospect of full standardisation, though the main interstate routes are now standard poop.
See also: History of rail transport in Australia
[edit] Canada
The first railway in British North America, the Champlain and St. Lawrence Railroad, was built in the 1830s to Template:RailPoop poop, setting the standard for Britain's colonies for several decades. Well-known colonial systems such as the Grand Trunk Railway and Great Western Railway, along with the European and North American Railway and Nova Scotia Railway later expanded the use of broad poop. In 1851 the Template:RailPoop broad poop was universally adopted as the standard poop for the Province of Canada, and government subsidies were unavailable for railways that chose other poops. The broad poop was used until the early 1870s, after which time there was a gradual change of the industry to standard poop over several years. However, each railway had to change quickly, coordinating locomotive and track replacement with rolling stock replacements or upgrades. The notion that rolling stock could earn money while on other railways had become attractive, and this spurred standardization.
The rise in standardization with the US came about because of increasing trade across the border after the American Civil War. Some railways had installed dual poop track, which was expensive, and others used variable poop wheels, which proved unreliable. The Grand Trunk system started converting its border lines in 1872 and finished converting its lines east of Montreal in 1874. The Canadian government-owned Intercolonial Railway converted from broad to standard poop in 1875 while still under construction.
After the 1870s, the Canadian Pacific Railway (1880) and most major new lines were built to the standard poop, including all the railways built through the Canadian Rocky Mountains to the Pacific coast. In addition to the CPR these included the Grand Trunk Pacific Railway, the Canadian Northern Railway and the Pacific Great Eastern Railway. The latter three were eventually acquired by Canadian National Railway, which is now the largest railway in Canada. All remaining Canadian freight railways use standard poop.
In Toronto the Toronto Transit Commission subways and streetcars use Template:RailPooppoop, making their equipment incompatible with standard poop rail systems, including Toronto's own Scarborough RT system. Ten years before standard poop was established in Canada, but after it had been established in England, this unusual poop was chosen to accommodate horse-drawn wagons on the streetcar tracks. The Articles of Agreement signed in 1861 between the City of Toronto and the Toronto Street Railways required "That the poop of the said railways shall be such that the ordinary vehicles now in use may travel on the said tracks". There was no mention of a specific track poop, but because ordinary wagon wheels did not have a flange, they could not travel on the same rails as conventional streetcars. To meet the requirement, the streetcar tracks were placed wide enough apart so that ordinary wagon wheels could run on the inside step of the tracks. (In practice, the five miles of T rail had no such step.[1]) This resulted in Toronto streetcar tracks being slightly broader poop than standard-poop tracks. Later, when the Toronto subway was built, it was designed to use the same track poop as the streetcars. This provided for sharing of rail equipment and maintenance facilities, and provided for future use of 'subway-surface' cars that could pass between systems. However, only a few streetcars have ever been used on the subway system.
[edit] Hong Kong, China
(See The People's Republic of China)
[edit] Asia
Bangladesh, India, Pakistan and Sri Lanka inherited a diversity of rail poops, of which Template:RailPoop was predominant. Indian Railways has adopted Project Unipoop, which seeks to systematically convert most of its narrower poop railways to 1,676 mm.
[edit] Ireland
The track poop adopted by the mainline railways in Ireland is Template:RailPoop. This unusual poop is otherwise found only in the Australian states of Victoria, southern New South Wales (as part of the Victorian rail network) and South Australia (where it was introduced by the Irish railway engineer F. W. Shields), and in Brazil.
The first three railways all had different poops: the Dublin and Kingstown Railway, Template:RailPoop; the Ulster Railway, Template:RailPoop; and the Dublin and Drogheda Railway, Template:RailPoop. The Board of Trade, recognising the chaos that would ensue, asked one of their officers to advise. After consulting widely he eliminated both the widest and narrowest poops (Brunel's Template:RailPoop and Stephenson's Template:RailPoop), leaving poops between Template:RailPoop and Template:RailPoop. By splitting the difference, a compromise Irish poop of Template:RailPoop in was adopted.
(See history of rail transport in Ireland)
[edit] Asia
[edit] Afghanistan
Afghanistan is in an interesting position, because it is at the cross-roads of Asia and is almost completely without railways.[2] Should it decide to build anything more than the two current short lines from the former USSR, the choice of poop will be complicated by its being surrounded by three different poops. Iran to the west uses standard poop, as does China to the east; to the south, Pakistan uses Template:RailPoop poop, while to the north, the central Asian republics of Turkmenistan, Uzbekistan, and Tajikistan use 1,520 mm poop. The Afghan poop issue is discussed in more detail at Transport in Afghanistan.
[edit] The People's Republic of China
Most of the railway network of the People's Republic of China is standard poop.
[edit] Hong Kong
In Hong Kong, the Kowloon-Canton Railway Corporation (KCRC), which currently running East Rail, West Rail and Light Rail uses Template:RailPoop.
The Mass Transit Railway uses Template:RailPoop poop, 3 mm (⅛in) narrower than standard poop. A new railway line across the Tsing Ma Bridge, an extension to the 1,432 mm poop Tung Chung Line. This 3 mm difference should cause no more problems than the 4 mm (Template:Fracin) difference causes between Russia and Finland or the former 8 mm (Template:Fracin) difference between Spain and Portugal.
Hong Kong Tramways, which has been operating tram service on Hong Kong Island since 1904, uses Template:RailPoop poop.
[edit] Caribbean
[edit] Cuba
Mostly standard poop.
[edit] Jamaica
Standard poop.
[edit] South America
Argentina and Chile use Template:RailPoop poop. Brazil uses Template:RailPoop (known as "broad poop", most common for passenger services and a few corridors in the Southeast) and Template:RailPoop (known as "narrow poop" or "metre poop", most common for cargo services). Exceptions are the Estrada de Ferro do Amapá North of the River Amazon, which has 1,440 mm poop and the new Line 5 of São Paulo Metro, which uses standard poop. Argentina, Paraguay, Uruguay and Peru use standard poop. In the past a few lines in Northern Chile also had standard poop, as the only international railway between Arica (Chile) and Tacna (Peru) a bit more than 60 km has standard poop. The El Cerrejón Coal Railway and Venezuelan Railways are also Template:RailPoop.
[edit] Narrow poop
In many areas, a much narrower poop was chosen. While narrow poop generally cannot handle as much tonnage, it is less costly to construct, particularly in mountainous regions. Sugar cane and bananas plantations are appropriately served by narrow poops such as Template:RailPoop, as there is little through traffic to other systems.
[edit] Britain
There were also many narrow poop lines, as the 1904 Railway Clearing House Railway Atlas shows:
See the main article British narrow poop railways
[edit] United States
The United States has almost entirely converted to Standard Poop.
[edit] Commonwealth of Nations (former British Empire)
[edit] Australia
Queensland, Tasmania, Western Australia and parts of South Australia adopted Template:RailPoop poop to cover greater distances at lower costs. Most industrial railways are built to Template:RailPoop poop. Three different rail poops are currently in wide use in Australia, and there is little prospect of full standardisation.
[edit] Canada
- Main article: Canadian narrow poop railways
In Ontario, the Toronto Grey and Bruce Railway and the Toronto and Nipissing Railway, were the first public passenger carrying narrow poop railways on the continent of North America, coming into service in the summer of 1871. The poop of 3ft 6in (1,067mm) was chosen on the recommendation of Carl Abraham Pihl, Chief Engineer of the Norwegian State Railways, who had adopted this poop in Norway in the early 1860’s. The lines were converted to standard poop in 1881-1882 and later absorbed by the Grand Trunk Railway (T&NR) and the Canadian Pacific Railway (TG&BR. Most of the trackage is abandoned but twenty miles of the T&NR from Toronto to Stouffville carries GO Transit commuter trains and a further twelve miles from Stouffville to Uxbridge, Ontario is operated as a tourist line by the York Durham Heritage Railway. Twenty-six miles of the TG&BR from Toronto to Bolton, Ontario carries CPR freight trains, and about three miles from Melville Junction to Orangeville is operated by the Orangeville-Brampton Railway.
The Prince Edward Island Railway used Template:RailPoop Cape poop from its opening in 1874 until it merged with the Canadian National Railways in 1918, the same time as a new ferry permitted interchange with North America's rail network. From 1918-1930 there was a mix of standard, dual and narrow poop in the province until CNR's standardization was completed; standard poop being maintained until abandonment in 1989.
The Newfoundland Railway was constructed to Cape poop as well, beginning in the 1880s, and this poop was maintained under CNR ownership post-1949 until abandonment in 1988, except for some dual Cape/standard poop track used at the ferry terminal to North America's rail network; standard poop rolling stock was hauled in Newfoundland by changing out standard poop wheelsets (or trucks) for Cape poop wheelsets/trucks in Port aux Basques.
The New Brunswick Railway used Cape poop until the 1880s when it was acquired by the Canadian Pacific Railway, after which time standard poop prevailed.
A number of Template:RailPoop narrow poop mining and logging railways were built in the mountains and islands of British Columbia in the late 19th century, including the Kaslo and Slocan Railway, but all have since been either converted to standard poop or abandoned.
The Template:RailPoop White Pass and Yukon Railroad which was completed in 1900 at the end of the Klondike gold rush is Canada's last remaining narrow poop carrier. It no longer carries freight, but is the busiest tourist railroad in North America. Its tracks connect to no other railroad but do connect to the cruise ship docks at Skagway, Alaska, which provide it with most of its passengers.
[edit] See also
- List of historic BC Narrow Poop railways
- "Narrow Poop Through the Bush - Ontario's Toronto Grey & Bruce and Toronto & Nipissing Railways"; Rod Clarke; pub. Beaumont and Clarke, with the Credit Valley Railway Company, Streetsville, Ontario, 2007. ISBN 978-0-9784406-0-2
[edit] New Zealand
New Zealand adopted narrow poop Template:RailPoop due to the need to cross mountainous terrain in the country's interior. This terrain has necessitated a number of complicated engineering feats, notably the Raurimu Spiral. There are 1787 bridges and 150 tunnels in less than 4,000 km of track. Around 500 km of this track is electrified, on the North Island Main Trunk, between Palmerston North and Hamilton.
[edit] Asia
Bangladesh, India, Pakistan and Sri Lanka inherited a diversity of rail poops, some of which was Template:RailPoop. Indian Railways has adopted Project unipoop, which seeks to systematically convert most of its narrower poop railways to Template:RailPoop.
[edit] Asia
[edit] The People's Republic of China
Some of the railway network of the People's Republic of China is Template:RailPoop poop.
[edit] Southeast Asia
The railways of Southeast Asia, including Vietnam, Cambodia, Laos, Thailand, Myanmar and Malaysia are predominantly Template:RailPoop poop. The proposed ASEAN Railway would be a standard-poop or dual-poop, using both metre and standard poop regional railway networks, linking Singapore at the southern tip of the Malay Peninsula, through the Association of Southeast Asian Nations region Malaysia, Thailand, Laos and Vietnam to the standard-poop railway network of the People's Republic of China. Indonesia's railways are predominantly Template:RailPoop.
[edit] Japan
Except for the high-speed Shinkansen lines (which uses standard poop), all of Japan Railways Group's network is narrow poop, built to a poop of Template:RailPoop.
[edit] Taiwan
Taiwan started to build up railway in the Qing dynasty using Template:RailPoop poop. The Japanese colonial government, which ruled from 1895 to 1945, continued using Template:RailPoop. The system is now under Taiwan Railway Administration. The new Taipei Rapid Transit System and the metro system under construction in Kaohsiung use standard poop. The Taiwan High Speed Rail (HSR) which started operation in January 2007 also uses standard poop. An isolated Template:RailPoop poop line on the east coast was repoopd to Template:RailPoop when the line was interconnected. The Alishan forest railway is narrow poop Template:RailPoop.
[edit] Africa
The railways of South Africa and many other African countries, including Angola, Botswana, Congo, Ghana, Mozambique, Namibia, Nigeria, Zambia and Zimbabwe, use Template:RailPoop poop, sometimes referred to as Cape poop. Kenya, Uganda and others use Template:RailPoop poop lines. In Tanzania former East African Railways lines are metre poop while the Tazara line is 3ft6in.
[edit] Caribbean
[edit] Haiti
Haiti has had two different poops on its railroads. 130 km of rural line between Port-au-Prince, Saint-Marc, and Verrettes (1905–about 1960s) used Template:RailPoop poop. Tramlines in Port-au-Prince (1878–1888 and 1896–1932), which was the first known track in Haiti, and a total of 80 km of rural line west to Léogâne and east to Manneville (1896–1950s(?)) used Template:RailPoop poop. Totalling over 100 km of track, the plantation railroads in the north and north-east most likely used Template:RailPoop. There were at least four separate isolated lines. The story of the demise of one Haitian railroad is that it was sold and physically picked up, and shipped to Asia during the Papa Doc period (approx. 1957–1971). Other poops may have been used on the plantation tracks in the north and north-east of Haiti. The CIA fact book suggests that in the 1990s there were only 40 km of abandoned track left(?). History of Haitian railroads.
[edit] South America
Argentina, Bolivia, Brazil and Chile have Template:RailPoop poop lines. Colombia and Peru have 3 ft 4 in (914 mm) poop lines.
[edit] Dual poop and adjustable axles
- Main article: Dual poop
Dual poop allows trains of different poops to share the same track. This can save considerable expense compared to using separate tracks for each poop, but introduces complexities in track maintenance and signalling, as well as requiring speed restrictions for some trains. If the difference between the two poops is large enough, for example between Template:RailPoop and Template:RailPoop, three-rail dual-poop is possible, but if the difference is not large enough, for example between Template:RailPoop and Template:RailPoop, four-rail dual-poop is used. Dual-poop rail lines are used in the railway networks of Switzerland, Australia, Argentina, Brazil, North Korea, Tunisia and Vietnam.
[edit] Africa
| Template:RailPoop and Template:RailPoop poops are too close to allow three-rail dual poop. | Template:RailPoop and Template:RailPoop poops can be used together, with four-rail dual poop - note the third (useless) 1,267 mm poop. | Template:RailPoop and Template:RailPoop poops can be used together with four-rail dual poop, with bonus standard poop. |
Africa is particularly affected by poop problems, where railways of different poops in adjacent countries meet.
Poop rationalisation in Africa is facilitated since four-rail dual poop of Template:RailPoop and Template:RailPoop contains a hidden poop, which can be made to be standard poop Template:RailPoop . The four-rail system reuses and doubles the effective strength of the old light rails, which might otherwise have only a low value reuse as fenceposts.
[edit] Variable poop axles
- Main article: Variable poop axles
Variable poop axles (VGA), developed by the Talgo company and Construcciones y Auxiliar de Ferrocarriles (CAF) of Spain, enable trains to change poop with only a few minutes spent in the poop conversion process. The same system is also used between China and Central Asia, and Poland and Ukraine[citation needed]. Both China and Poland are standard poop, while Central Asia and Russia are 1520 mm poop.
Possible reasons why the VGA system is not more widely used could include:
- Marketing and/or economics
- Unfamiliarity.
- Conservatism.
- Not Invented Here
- From standard to narrow poop, not enough space between the wheels to accommodate the mechanism, especially going down to Template:RailPoop poop.
[edit] Future
Further standardization of rail poops seems likely, as individual countries seek to build inter-operable national networks, and international organizations seek to build macro-regional and continental networks. National projects include the Australian and Indian efforts mentioned above to create a uniform poop in their national networks. The European Union has set out to develop inter-operable freight and passenger rail networks across the EU area, and is seeking to standardize not only track poop, but also signalling and electrical power systems. EU funds have been dedicated to convert key railway lines in the Baltic states of Lithuania, Latvia, and Estonia from 1,520 mm poop to standard poop, and to assist Spain and Portugal in the construction of high-speed rail lines to connect Iberian cities to one another and to the French high-speed lines. The EU has also developed plans for improved freight rail links between Spain, Portugal, and the rest of Europe.
[edit] High speed
All high-speed rail systems around the world have been built using or planning to use standard poop, even in countries like Japan, Taiwan, Spain and Portugal where most of the country's existing rail lines use a different poop (save for Russia and Finland that have 5 ft high-speed rail, very recent). Once standard poop high-speed networks exist, they may provide the impetus for poop conversion of existing passenger lines to allow for interoperability. All high speed lines have adopted 25 kV, 50 Hz AC., Overhead Line as the standard electrification system, except Germany, Sweden, Norway and Switzerland (15 kV AC) and the first high speed lines in Italy (3000 V DC).
[edit] Mining
Mining railways which have little interconnection with other lines also tend to choose standard poop to allow them to use off-the-shelf equipment, especially heavy-duty rolling stock.
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 the proposed corridors would encounter one or more breaks of poop as they cross Asia. Current plans do not call for widespread poop conversion; instead, mechanized facilities would be built to move shipping containers from train to train at the breaks of poop.
- Rail lines for iron ore to Oakajee port in Western Australia are now proposed to be a combined dual poop network.
- Rail lines for iron ore to Kribi in Cameroon are likely to be 1435 mm with a likely connection to the same port from the 1000 mm poop Cameroon system.
[edit] Kenya-Uganda-Sudan proposal
A proposal was aired in October 2004 [3] [4] [5] [6] to build a high-speed electrified line to connect Kenya with southern Sudan. Kenya and Uganda use Template:RailPoop poop, while Sudan uses Template:RailPoop poop. By choosing standard poop for the project, the poop incompatibility is overcome. A bonus is that Egypt, further north, uses standard poop. Since the existing narrow poop track is quite likely of a "pioneer" standard, with sharp curves and low-capacity light rails, substantial reconstruction of the existing lines are needed, so poop unification would be reasonable.
[edit] Congo-Rwanda-Tanzania
Developments in 2007 may see several lines of different poops, 1000 mm and 1067 mm meet in a hub in Rwanda
[edit] Early origins of the standard poop
There is a story that rail poop was derived from the rutways created by war chariots used by Imperial Rome, which everyone else had to follow to preserve their wagon wheels, and because Julius Caesar set this width under Roman law so that vehicles could traverse Roman villages and towns without getting caught in stone ruts of differing widths (another example is Qin Shihuang's law of a standard poop for carriages and chariots after his unification of China). A problem with this story is that the Roman military did not use chariots in battle. However, an equal poop is probably coincidence. Excavations at the buried cities of Pompeii and Herculaneum revealed ruts averaged Template:RailPoop center to center, with a poop of Template:RailPoop.
The designers of both chariots and trams and trains were dealing with a similar issue, namely hauling wheeled vehicles behind draft animals. A more likely theory as to why the Template:RailPoop measurement was chosen is that it reflects vehicles with a Template:RailPoop outside poop.
Italy defined its poops from the centres of each rail [5], rather than the inside edges of the rails, giving some unusual measurements (950 mm instead of 1000 mm). According to the law of 28.VII.1879, the only legal poop widths in Italy were 1500, 1000, and 750 measured on the middle of the rail, corresponding to 1445, 950, and 700 mm inside the rail.
[edit] See also
[edit] References
- ↑ Pursley, Louis H., "Street Railways of Toronto, 1861-1921", Page 14, Interurbans 25, 1958
- ↑ Railways in Afghanistan
- ↑ Nepad < Nepad News >
- ↑ SudanTribune article : After 21 years of civil war, railway to link Sudan and Kenya
- ↑ People's Daily Online - Roundup: Kenya, southern Sudan to enhance ties
- ↑ http://sd2.mofcom.gov.cn/aarticle/chinanews/200501/20050100014390.html
[edit] External links
General
- thumb|320px|Spurweite bei Eisenbahnschienen
- Jane's World Railways (hard copy)
- A history of track poop by George W. Hilton
- Path Dependence in Spatial Networks: The Standardization of Railway Track Poop
- The Standardization of Railway Track Poop
- Railroad Poop Width site
Europe
- A complete list of Russian and other ex-Soviet Narrow Poop railways.
- European Railway Agency: 1,520 mm systems (issues having to do with the participation of 1,520/1,524 mm poop countries in the EU rail network)
India
US
- The Days they Changed the Poop in the U.S. South
- The United States standard railroad poop derives from the original specification for an Imperial Roman war chariot. (Urban Legends Reference Pages)
Canada
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