5 ft 6 in gauge railway explained

is a broad track gauge, used in India, Pakistan, western Bangladesh, Sri Lanka, Argentina, Chile, and on BART in the San Francisco Bay Area.

In North America, it is called Indian, Provincial, Portland, or Texas gauge. In Argentina and Chile, it is known as "trocha ancha" (Spanish for "broad gauge"). In the Indian subcontinent it is simply known as "broad gauge". It is the widest gauge in regular passenger use anywhere in the world.

Asia

India

See main article: Rail transport in India.

See also: Indian Railways. In India, the initial freight railway lines were built using standard gauge. In the 1850s, the Great Indian Peninsula Railway adopted the gauge of for the first passenger railway in India between Bori Bunder and Thane.[1] [2] This was then adopted as the standard for the nationwide network.

Indian Railways today predominantly operates on broad gauge. Most of the metre gauge and narrow gauge railways have been converted to broad gauge. Small stretches of the network that remain on metre and narrow gauges are also being converted to broad gauge. Rapid transit lines are mostly on standard gauge, although some initial lines use broad gauge.

Bangladesh

See main article: Bangladesh Railway. Bangladesh Railways uses a mix of broad gauge and metre gauge. The broad gauge network is primarily located to the west of the Jamuna River, while the metre gauge network is primarily located to its east. The Jamuna Bridge is a mixed-use bridge that contains a dual gauge connection across the river linking both networks.

Nepal

See main article: Nepal Railway Company Limited. In Nepal, all services currently operate on broad gauge only.

Pakistan

See main article: Pakistan Railways. In Pakistan, all services currently operate on broad gauge only, except for a line of Lahore metro.

Sri Lanka

See main article: Sri Lanka Railways. In Sri Lanka, all services currently operate on broad gauge only.

Europe

United Kingdom

The broad gauge was first used in Scotland for two short, isolated lines, the Dundee and Arbroath Railway (1836-1847) and the Arbroath and Forfar Railway (1838-). Both the lines were subsequently converted to standard gauge.

Spain and Portugal

The Iberian-gauge railways, that service much of Spain and Portugal, have a track gauge of, just different from . Used rolling stock from Iberia has been employed on broad-gauge lines in Argentina and Chile.

North America

See main article: Track gauge in North America.

Canada

See main article: Track gauge in Canada. Canada became the first British colony, in the 1850s, to use broad gauge. It was known as the "Provincial gauge" in Canada.

The earliest railways in Canada, including the 1836 Champlain and St. Lawrence and 1847 Montreal and Lachine Railway however, were built to .[3]

The Grand Trunk Railway which operated in several Canadian provinces (Quebec and Ontario) and American states (Connecticut, Maine, Massachusetts, New Hampshire, and Vermont) used it, but was changed to standard gauge in 1873. The Grand Trunk Railway operated from headquarters in Montreal, Quebec, although corporate headquarters were in London, England. The St. Lawrence and Atlantic Railroad which operated in Quebec, Vermont, New Hampshire and Maine also used it but was converted in 1873.

There is a longstanding rumour that the Provincial gauge was selected specifically to create a break-of-gauge with US railways, the War of 1812 still being a fresh memory. However, there is little supporting evidence for this, and this story appears to be traced to a single claim from the late 1800s.[3]

United States

See main article: Track gauge in the United States. The Bay Area Rapid Transit system is the only operating railroad in the United States to use broad gauge, with 120miles of double tracked routes. The original engineers chose the wide gauge for its "great stability and smoother riding qualities"[4] and intended to make a state-of-the-art system for other municipalities to emulate. The use of broad gauge rails was one of many unconventional design elements included in its design which, in addition to its unusual gauge, also used flat-edge rail, rather than typical rail that angles slightly inward (although the shape of BART wheels and rail has been modified since then[5]). This has complicated maintenance of the system, as it requires custom wheelsets, brake systems, and track maintenance vehicles.[6]

The New Orleans, Opelousas and Great Western Railroad (NOO&GW) used broad gauge until 1872, and the Texas and New Orleans Railroad used broad gauge ("Texas gauge") until 1876. The Grand Trunk Railway predecessor St. Lawrence and Atlantic Railroad which operated in Quebec, Vermont, New Hampshire and Maine also used broad gauge ("Canadian gauge", "Provincial gauge" or "Portland gauge") but was converted in 1873. Several Maine railroads connected to the Grand Trunk Railway shared its "Portland Gauge". The Androscoggin and Kennebec Railroad and the Buckfield Branch Railroad were later consolidated as the Maine Central Railroad which converted to standard gauge in 1871. John A. Poor's chief engineer Alvin C. Morton compiled the following advantages of "Portland Gauge" for Maine railways in 1847:[7]

South America

Argentina

See main article: Rail transport in Argentina. The national railway network is predominantly on broad gauge.

Chile

See main article: Track gauge in Chile. Most links of broad gauge railways are in the center-south of the country. Only a few lines of the Ferrocarril del Sur (Southern Railroad Network) were or, the notable exceptions being one of the few active links: the Ramal Talca-Constitución branch and the Metro de Santiago. On the contrary, just a few branches of the FCN (Ferrocarril del Norte) were broad gauge, most notably the Mapocho-Puerto mainline between Santiago and Valparaiso, the Santiago–Valparaíso railway line. This link was directly connected to the southern railroad network using the Matucana tunnel that connected Mapocho and the Central Station in Santiago. The Transandine Railway that connected both Argentinean and Chilean broad gauge networks through the Uspallata pass in the Andes mountains was actually a narrow gauge link.

Similar gauges and compatibility

See main article: Rail transport in Spain and Rail transport in Portugal. The Iberian gauge is closely similar to the Indian gauge, with only 8abbr=onNaNabbr=on difference, and allows compatibility with the rolling stock. For example, in recent years Chile and Argentina have bought second hand Spanish/Portuguese Iberian-gauge rolling stock. 1,668 mm trains can run on 1,676 mm gauge without adaptation, but for better stability in high-speed running a wheelset replacement may be required (for example, Russian-Finnish train Allegro has gauge, intermediate between Russian and Finnish). Backward compatibility—1,676 mm trains on 1,668 mm gauge—is possible, but no examples and data exist. Due to the narrower gauge, a strong wear of wheelsets may occur without replacement.

Operational railways

Country/territoryRailwayRoute lengthNotes
ArgentinaSan Martín Railwayoperating
ArgentinaSarmiento Railwayoperating
ArgentinaMitre Railwayexcept Tren de la Costa in standard gauge; operating
Argentinaexcept La Trochita, Central Chubut Railway and in 750 mm (2 ft 5 1⁄2 in) gauge; operating
Bangladeshoperating
ChileEmpresa de los Ferrocarriles del Estado - EFE Suroperating
ChileEmpresa de los Ferrocarriles del Estado - EFE CentralExcept Ramal Talca-Constitución; operating
ChileEmpresa de los Ferrocarriles del Estado - Metro de Valparaísooperating
ChileEmpresa de los Ferrocarriles del Estado - Biotrénoperating
India126,366 km
(78,520 mi)
operating
IndiaDelhi Metrooperating
IndiaKolkata Metrooperating
IranZahedan railway station to border with Pakistanoperating
NepalNepal Railwaysoperating
PakistanPakistan Railwaysoperating
Sri LankaSri Lanka Railwaysoperating
United StatesBay Area Rapid Transit (BART) San Francisco Bay Areaoperating

Closed railways

Country/territoryRailwayLengthNotes
CanadaGrand Trunk RailwayConverted to in 1873
CanadaSt. Lawrence and Atlantic RailroadConverted to in 1873
CanadaGrand Trunk Railway of CanadaConverted to
CanadaIntercolonial Railway of CanadaConverted to in 1875
ParaguayParaguayan railwayFrom Asunción to Encarnación was originally laid in this gauge in the hope that the connecting line from Posadas to Buenos Aires would be built to the same gauge; that line was laid to standard gauge, and when the FCPCAL reached Encarnación in 1912 the whole line had to be re-gauged to standard gauge to allow through-working.
United KingdomArbroath and Forfar Railwaysee Scotch gauge, converted to standard gauge
United KingdomDundee and Arbroath Railwaysee Scotch gauge, converted to standard gauge
United StatesMaine Central Railroadconverted to standard gauge in 1871

See also

Notes and References

  1. Web site: Railroads Asia - Up And Down India.
  2. Indian Railways: Some Fascinating Facts, “Train Atlas”, Train Atlas, Indian Railways, 2003
  3. Omer Lavallee, "The Rise and Fall of the Provincial Gauge", Canadian Rail, February 1963, pp. 22-37
  4. Web site: Why Does BART Use Wider Non-Standard Gauge Rails. BayRail Alliance.
  5. News: Refining Approaches to Corrective and Preventive Rail Grinding . February 26, 2019 . ON Track Maintenance . Bob . Tuzik .
  6. News: Has BART's cutting-edge 1972 technology design come back to haunt it? . Gafni . Matthias . San Jose Mercury News . March 25, 2016 . March 28, 2016.
  7. Book: The Grand Trunk in New England . Holt, Jeff . Railfare . 1985 . 0-919130-43-7 . 78.