5 ft 6 in gauge railway

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 gauge", 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. Rail transport in IndiaIndian 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. 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 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 Railway Company Limited In Nepal, all services currently operate on broad gauge only. Pakistan Railways In Pakistan, all services currently operate on broad gauge only. Sri Lanka Railways In Sri Lanka, all services currently operate on broad gauge only. 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. The Iberian-gauge railways, that service much of Spain and Portugal, have a track gauge of , just different from .