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50-519: The line is a single track and electrified narrow gauge railway with a third rail . Opened in 1975, it has a length of 1.3 kilometres (0.81 mi) and three stations. It starts at the entrance of the caves, nearby Psyrtscha station of the Abkhazian railway . From the Entrance Gate station, it reaches two cave halls: Apsny Hall (or Abkhazia) and Anakopea Hall. Apsny station serves to lead the tourists at

100-672: A 3 ft 6 in ( 1,067 mm ) gauge, whereas Vietnam, Malaysia and Thailand have metre-gauge railways . Narrow-gauge trams, particularly metre-gauge, are common in Europe. Non-industrial, narrow-gauge mountain railways are (or were) common in the Rocky Mountains of the United States and the Pacific Cordillera of Canada, Mexico, Switzerland, Bulgaria, the former Yugoslavia , Greece, and Costa Rica. A narrow-gauge railway

150-628: A country (for example, 1,440 mm or 4 ft  8 + 11 ⁄ 16  in to 1,445 mm or 4 ft  8 + 7 ⁄ 8  in in France). The first tracks in Austria and in the Netherlands had other gauges ( 1,000 mm or 3 ft  3 + 3 ⁄ 8  in in Austria for the Donau Moldau line and 1,945 mm or 6 ft  4 + 9 ⁄ 16  in in

200-425: A curve with standard-gauge rail ( 1435 mm ) can allow speed up to 145 km/h (90 mph), the same curve with narrow-gauge rail ( 1067mm ) can only allow speed up to 130 km/h (81 mph). In Japan and Queensland, recent permanent-way improvements have allowed trains on 3 ft 6 in ( 1,067 mm ) gauge tracks to exceed 160 km/h (99 mph). Queensland Rail 's Electric Tilt Train ,

250-455: A design speed of 137 km/h (85 mph). Curve radius is also important for high speeds: narrow-gauge railways allow sharper curves, but these limit a vehicle's safe speed. Many narrow gauges, from 15 in ( 381 mm ) gauge to 4 ft 8 in ( 1,422 mm ) gauge, are in present or former use. They fall into several broad categories: 4 ft 6 in ( 1,372 mm ) track gauge (also known as Scotch gauge)

300-474: A heavy-duty narrow-gauge line is Brazil's EFVM . 1,000 mm ( 3 ft  3 + 3 ⁄ 8  in ) gauge, it has over-100-pound rail (100 lb/yd or 49.6 kg/m) and a loading gauge almost as large as US non-excess-height lines. The line has a number of 4,000-horsepower (3,000 kW) locomotives and 200-plus-car trains. Narrow gauge's reduced stability means that its trains cannot run at speeds as high as on broader gauges. For example, if

350-498: A mine in Bohemia with a railway of about 2 ft ( 610 mm ) gauge. During the 16th century, railways were primarily restricted to hand-pushed, narrow-gauge lines in mines throughout Europe. In the 17th century, mine railways were extended to provide transportation above ground. These lines were industrial , connecting mines with nearby transportation points (usually canals or other waterways). These railways were usually built to

400-785: A number of large 3 ft ( 914 mm ) railroad systems in North America; notable examples include the Denver & Rio Grande and Rio Grande Southern in Colorado; the Texas and St. Louis Railway in Texas, Arkansas and Missouri; and, the South Pacific Coast , White Pass and Yukon Route and West Side Lumber Co of California. 3 ft was also a common track gauge in South America, Ireland and on

450-586: A range of industrial railways running on 500 mm ( 19 + 3 ⁄ 4  in ) and 400 mm ( 15 + 3 ⁄ 4  in ) tracks, most commonly in restricted environments such as underground mine railways, parks and farms, in France. Several 18 in ( 457 mm ) gauge railways were built in Britain to serve ammunition depots and other military facilities, particularly during World War I . Standard-gauge railway A standard-gauge railway

500-505: A standard gauge of 4 ft  8 + 1 ⁄ 2  in ( 1,435 mm ), and those in Ireland to a new standard gauge of 5 ft 3 in ( 1,600 mm ). In Great Britain, Stephenson's gauge was chosen on the grounds that existing lines of this gauge were eight times longer than those of the rival 7 ft or 2,134 mm (later 7 ft  1 ⁄ 4  in or 2,140 mm ) gauge adopted principally by

550-1034: A third rail, and also at passenger stations where the third rail has no voltage for safety reasons. Narrow gauge railway A narrow-gauge railway ( narrow-gauge railroad in the US) is a railway with a track gauge narrower than 1,435 mm ( 4 ft  8 + 1 ⁄ 2  in ) standard gauge . Most narrow-gauge railways are between 600 mm ( 1 ft  11 + 5 ⁄ 8  in ) and 1,067 mm ( 3 ft 6 in ). Since narrow-gauge railways are usually built with tighter curves , smaller structure gauges , and lighter rails ; they can be less costly to build, equip, and operate than standard- or broad-gauge railways (particularly in mountainous or difficult terrain). Lower-cost narrow-gauge railways are often used in mountainous terrain, where engineering savings can be substantial. Lower-cost narrow-gauge railways are often built to serve industries as well as sparsely populated communities where

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600-711: Is a railway with a track gauge of 1,435 mm ( 4 ft  8 + 1 ⁄ 2  in ). The standard gauge is also called Stephenson gauge (after George Stephenson ), international gauge , UIC gauge , uniform gauge , normal gauge in Europe, and SGR in East Africa. It is the most widely used track gauge around the world, with about 55% of the lines in the world using it. All high-speed rail lines use standard gauge except those in Russia , Finland , Uzbekistan , and some line sections in Spain . The distance between

650-487: Is a track gauge of 1,000 mm ( 3 ft  3 + 3 ⁄ 8  in ). It has about 95,000 km (59,000 mi) of track. According to Italian law, track gauges in Italy were defined from the centre of each rail rather than the inside edges of the rails. This gauge, measured 950 mm ( 3 ft  1 + 3 ⁄ 8  in ) between the edges of the rails, is known as Italian metre gauge . There were

700-745: Is currently operated by the Ghana Railway Company Limited . Kojokrom-Sekondi Railway Line (The Kojokrom-Sekondi line is a branch line that joins the Western Railway Line at Kojokrom ) Indian nationwide rail system ( Indian Railways ) uses 1,676 mm ( 5 ft 6 in ) broad gauge. 96% of the broad gauge network is electrified. The railway tracks of Java and Sumatra use 1,067 mm ( 3 ft 6 in ). Planned and under construction high-speed railways to use 1,668 mm ( 5 ft  5 + 21 ⁄ 32  in ) to maintain interoperability with

750-480: Is one where the distance between the inside edges of the rails is less than 1,435 mm ( 4 ft  8 + 1 ⁄ 2  in ). Historically, the term was sometimes used to refer to what are now standard-gauge railways , to distinguish them from broad-gauge railways , but this use no longer applies. The earliest recorded railway appears in Georgius Agricola 's 1556 De re metallica , which shows

800-1013: The Isle of Man . 900 mm was a common gauge in Europe. Swedish three-foot-gauge railways ( 891 mm or 2 ft  11 + 3 ⁄ 32  in ) are unique to that country and were once common all over the country. Today the only 891 mm line that remains apart from heritage railways is Roslagsbanan , a commuter line that connects Stockholm to its northeastern suburbs. A few railways and tramways were built to 2 ft 9 in ( 838 mm ) gauge, including Nankai Main Line (later converted to 3 ft 6 in or 1,067 mm ), Ocean Pier Railway at Atlantic City , Seaton Tramway ( converted from 2 ft ) and Waiorongomai Tramway . 800 mm ( 2 ft  7 + 1 ⁄ 2  in ) gauge railways are commonly used for rack railways . Imperial 2 ft 6 in ( 762 mm ) gauge railways were generally constructed in

850-548: The Liverpool and Manchester Railway , authorised in 1826 and opened 30 September 1830. The extra half inch was not regarded at first as very significant, and some early trains ran on both gauges daily without compromising safety. The success of this project led to Stephenson and his son Robert being employed to engineer several other larger railway projects. Thus the 4 ft  8 + 1 ⁄ 2  in ( 1,435 mm ) gauge became widespread and dominant in Britain. Robert

900-565: The 500mm gauge tracks of their mine railway ; these locomotives were made by the Deutz Gas Engine Company ( Gasmotorenfabrik Deutz ), now Deutz AG . Another early use of internal combustion was to power a narrow-gauge locomotive was in 1902. F. C. Blake built a 7 hp petrol locomotive for the Richmond Main Sewerage Board sewage plant at Mortlake . This 2 ft 9 in ( 838 mm ) gauge locomotive

950-889: The Great Western Railway. It allowed the broad-gauge companies in Great Britain to continue with their tracks and expand 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 completed the conversion of its network to standard gauge in 1892. In North East England, some early lines in colliery ( coal mining ) areas were 4 ft 8 in ( 1,422 mm ), while in Scotland some early lines were 4 ft 6 in ( 1,372 mm ). The British gauges converged starting from 1846 as

1000-631: The Netherlands for the Hollandsche IJzeren Spoorweg-Maatschappij ), but for interoperability reasons (the first rail service between Paris and Berlin began in 1849, first Chaix timetable) Germany adopted standard gauges, as did most other European countries. The modern method of measuring rail gauge was agreed in the first Berne rail convention of 1886. Several lines were initially built as standard gauge but were later converted to another gauge for cost or for compatibility reasons. 2,295 km (1,426 mi) Victoria built

1050-928: The Philippines demonstrate that if track is built to a heavy-duty standard, performance almost as good as a standard-gauge line is possible. Two-hundred-car trains operate on the Sishen–Saldanha railway line in South Africa, and high-speed Tilt Trains run in Queensland. In South Africa and New Zealand, the loading gauge is similar to the restricted British loading gauge; in New Zealand, some British Rail Mark 2 carriages have been rebuilt with new bogies for use by Tranz Scenic (Wellington-Palmerston North service), Tranz Metro (Wellington-Masterton service), and Auckland One Rail (Auckland suburban services). Another example of

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1100-629: The advantages of equipment interchange became increasingly apparent. By the 1890s, the entire network was converted to standard gauge. The Royal Commission made no comment about small lines narrower than standard gauge (to be called "narrow gauge"), such as the Ffestiniog Railway . Thus it permitted a future multiplicity of narrow gauges in the UK. It also made no comments about future gauges in British colonies, which allowed various gauges to be adopted across

1150-557: The beginnings of the show cave , and Anakopea to bring them back to the entrance gate, at the end of the tour. The line counts a depot just before Entrance station, and a service tunnel between it and Apsny. (shesasvleli tchishkari) (ap'khazet'i) (t'bilisi) The railway has three power-concentrated battery electric multiple units built by the Railroad Machinery Plants of Riga in Latvia , including two Ep «Tourist» trains and

1200-911: The coal industry. Some sugar cane lines in Cuba were 2 ft  3 + 1 ⁄ 2  in ( 699 mm ). 2 ft ( 610 mm ) gauge railways were generally constructed in the former British colonies. The U.S. had a number of railways of that gauge , including several in the state of Maine such as the Wiscasset, Waterville and Farmington Railway . 1 ft  11 + 3 ⁄ 4  in ( 603 mm ), 600 mm ( 1 ft  11 + 5 ⁄ 8  in ) and 1 ft  11 + 1 ⁄ 2  in ( 597 mm ) were used in Europe. Gauges below 1 ft  11 + 1 ⁄ 2  in ( 597 mm ) were rare. Arthur Percival Heywood developed 15 in ( 381 mm ) gauge estate railways in Britain and Decauville produced

1250-476: 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 . Opening in 1825,

1300-525: The colonies. Parts of the United States, mainly in the Northeast, adopted the same gauge, because some early trains were purchased from Britain. The American gauges converged, as the advantages of equipment interchange became increasingly apparent. Notably, all the 5 ft ( 1,524 mm ) broad gauge track in the South was converted to "almost standard" gauge 4 ft 9 in ( 1,448 mm ) over

1350-459: The course of two days beginning on 31 May 1886. See Track gauge in the United States . In continental Europe, France and Belgium adopted a 1,500 mm ( 4 ft  11 + 1 ⁄ 16  in ) gauge (measured between the midpoints of each rail's profile ) for their early railways. The gauge between the interior edges of the rails (the measurement adopted from 1844) differed slightly between countries, and even between networks within

1400-533: The fastest train in Australia and the fastest 3 ft 6 in ( 1,067 mm ) gauge train in the world, set a record of 210 km/h (130 mph). The speed record for 3 ft 6 in ( 1,067 mm ) narrow-gauge rail is 245 km/h (152 mph), set in South Africa in 1978. A special 2 ft ( 610 mm ) gauge railcar was built for the Otavi Mining and Railway Company with

1450-735: The first railways to the 5 ft 3 in ( 1,600 mm ) Irish broad gauge. New South Wales then built to the standard gauge, so trains had to stop on the border and passengers transferred, which was only rectified in the 1960s. Queensland still runs on a narrow gauge but there is a standard gauge line from NSW to Brisbane. NMBS/SNCB 3,619 km (2,249 mi) Brussels Metro 40 km (25 mi) Trams in Brussels 140 km (87 mi) 1,032 km (641 mi) The Toronto Transit Commission uses 4 ft  10 + 7 ⁄ 8  in ( 1,495 mm ) gauge on its streetcar and subway lines. Takoradi to Sekondi Route,

1500-470: The former British colonies . 760 mm Bosnian gauge and 750 mm railways are predominantly found in Russia and Eastern Europe. Gauges such as 2 ft 3 in ( 686 mm ), 2 ft 4 in ( 711 mm ) and 2 ft  4 + 1 ⁄ 2  in ( 724 mm ) were used in parts of the UK, particularly for railways in Wales and the borders, with some industrial use in

1550-429: 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, debuting around 1850, to the 1,435 mm ( 4 ft  8 + 1 ⁄ 2  in ) gauge. The historic Mount Washington Cog Railway ,

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1600-534: The inner sides of the rails) to be used. Different railways used different gauges, and where rails of different gauge met – a " gauge break " – loads had to be unloaded from one set of rail cars and reloaded onto another, a time-consuming and expensive process. The result was the adoption throughout a large part of the world of a "standard gauge" of 1,435 mm ( 4 ft  8 + 1 ⁄ 2  in ), allowing interconnectivity and interoperability. A popular legend that has circulated since at least 1937 traces

1650-400: The inside edges of the rails is defined to be 1,435 mm except in the United States, Canada, and on some heritage British lines, where it is defined in U.S. customary / Imperial units as exactly "four feet eight and one half inches", which is equivalent to 1,435.1   mm. As railways developed and expanded, one of the key issues was the track gauge (the distance, or width, between

1700-496: The newly built Ep-563 train, and also the auxiliary mining battery-electric locomotive ARP8 which is used in case of malfunction of EMU's motor car. Two Ep trains were built in 1975 and later both of them were modernized in Moscow in 2005 and 2009. In 2013, due to the wear of these trains, the railway management ordered a new train in Riga, which was built the next year. Since 2014 this has been

1750-546: The only train in use. The first Ep train is based at Anakopia station for doubling the Ep 563 train in case of malfunction. Another Ep train is based at the depot. Each train consists of 6 cars, including 1 power car with driver's cab, motors and power equipment and 5 trailer cars for passengers (4 intermediate cars and 1 observation car in the end). Both models run either on a third rail with 300 V DC or batteries with 240 V DC being used for short unelectrified sections at switches without

1800-499: The origin of the 1,435 mm ( 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 . Snopes categorised this legend as "false", but commented that it "is perhaps more fairly labeled as 'Partly true, but for trivial and unremarkable reasons. ' " The historical tendency to place

1850-405: The outermost portions of the wheel rims, it became apparent that for vehicles travelling on rails, having main wheel flanges that fit inside the rails is better, thus the minimum distance between the wheels (and, by extension, the inside faces of the rail heads ) was the important one. A standard gauge for horse railways never existed, but rough groupings were used; in the north of England none

1900-411: The rest of the network. All other railways use 1,668 mm ( 5 ft  5 + 21 ⁄ 32  in ) ( broad gauge ) and/or 1,000 mm ( 3 ft  3 + 3 ⁄ 8  in ) metre gauge . BLS , Rigi Railways (rack railway) 449 km Several states in the United States had laws requiring road vehicles to have a consistent gauge to allow them to follow ruts in

1950-537: The same narrow gauge as the mine railways from which they developed. The world's first steam locomotive , built in 1802 by Richard Trevithick for the Coalbrookdale Company, ran on a 3 ft ( 914 mm ) plateway . The first commercially successful steam locomotive was Matthew Murray 's Salamanca built in 1812 for the 4 ft 1 in ( 1,245 mm ) Middleton Railway in Leeds . Salamanca

2000-485: The term "narrow gauge" for gauges less than standard did not arise for many years, until the first such locomotive-hauled passenger railway, the Ffestiniog Railway , was built. In 1845, in the United Kingdom of Great Britain and Ireland , a Royal Commission on Railway Gauges reported in favour of a standard gauge. The subsequent Gauge Act ruled that new passenger-carrying railways in Great Britain should be built to

2050-469: The traffic potential would not justify the cost of a standard- or broad-gauge line. Narrow-gauge railways have specialised use in mines and other environments where a small structure gauge necessitates a small loading gauge . In some countries, narrow gauge is the standard: Japan, Indonesia, Taiwan, New Zealand, South Africa, and the Australian states of Queensland , Western Australia and Tasmania have

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2100-434: The wheels of horse-drawn vehicles around 5 ft ( 1,524 mm ) apart probably derives from the width needed to fit a carthorse in between the shafts. Research, however, has been undertaken to support the hypothesis that "the origin of the standard gauge of the railway might result from an interval of wheel ruts of prehistoric ancient carriages". In addition, while road-travelling vehicles are typically measured from

2150-426: 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 ( 1,422 mm ) gauge since its inauguration in 1868. George Stephenson introduced the 1,435 mm ( 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

2200-556: The world; 19th-century mountain logging operations often used narrow-gauge railways to transport logs from mill to market. Significant sugarcane railways still operate in Cuba, Fiji, Java, the Philippines, and Queensland, and narrow-gauge railway equipment remains in common use for building tunnels. In 1897, a manganese mine in the Lahn valley in Germany was using two benzine -fueled locomotives with single cylinder internal combustion engines on

2250-519: Was adopted by early 19th-century railways, primarily in the Lanarkshire area of Scotland. 4 ft  6 + 1 ⁄ 2  in ( 1,384 mm ) lines were also constructed, and both were eventually converted to standard gauge. 1,067 mm ( 3 ft 6 in ) between the inside of the rail heads, its name and classification vary worldwide and it has about 112,000 kilometres (70,000 mi) of track. As its name implies, metre gauge

2300-551: Was also the first rack-and-pinion locomotive. During the 1820s and 1830s, a number of industrial narrow-gauge railways in the United Kingdom used steam locomotives. In 1842, the first narrow-gauge steam locomotive outside the UK was built for the 1,100 mm ( 3 ft  7 + 5 ⁄ 16  in )-gauge Antwerp-Ghent Railway in Belgium. The first use of steam locomotives on a public, passenger-carrying narrow-gauge railway

2350-492: Was in 1865, when the Ffestiniog Railway introduced passenger service after receiving its first locomotives two years earlier. Many narrow-gauge railways were part of industrial enterprises and served primarily as industrial railways , rather than general carriers. Common uses for these industrial narrow-gauge railways included mining, logging, construction, tunnelling, quarrying, and conveying agricultural products. Extensive narrow-gauge networks were constructed in many parts of

2400-768: Was 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 ) (in Beamish ) or 4 ft  7 + 1 ⁄ 2  in ( 1,410 mm ) (in Bigges Main (in Wallsend ), Kenton , and Coxlodge ). English railway pioneer George Stephenson spent much of his early engineering career working for

2450-582: Was probably the third petrol-engined locomotive built. Extensive narrow-gauge rail systems served the front-line trenches of both sides in World War I . They were a short-lived military application, and after the war the surplus equipment created a small boom in European narrow-gauge railway building. The heavy-duty 3 ft 6 in ( 1,067 mm ) narrow-gauge railways in Australia (Queensland), New Zealand, South Africa, Japan, Taiwan, Indonesia and

2500-589: Was reported to have said that if he had had a second chance to choose a gauge, he would have chosen one wider than 4 ft  8 + 1 ⁄ 2  in ( 1,435 mm ). "I would take a few inches more, but a very few". During the " gauge war " with the Great Western Railway , standard gauge was called " narrow gauge ", in contrast to the Great Western's 7 ft  1 ⁄ 4  in ( 2,140 mm ) broad gauge . The modern use of

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