The three main railway gauges in Australia are narrow: 1,067 mm (3 ft 6 in), standard: 1,435 mm ( 4 ft 8+1/2 in), and broad: 1,600 mm (5 ft 3 in). A slow progression towards unification to standard gauge has taken place since the 1930s.
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Most railways in Europe use the standard gauge of 1,435 mm ( 4 ft 8+1/2 in). Some countries use broad gauge, of which there are three types.
In 1970, the Soviet Union began a smooth change of the track gauge from 1,524 mm to 1,5200 mm. This process lasted over 20 years, until the early 1990s. Various official sources indicate that the aim for the change was to increase the stability of the railways when operating freight trains, increasing their speed.
In fact, it is known as the “Iberian gauge”. This can be traced back to 1844, when a group of technicians stated that, due to the Spanish and Portuguese orography, the width of the inner sides of the tracks had to be increased.
Before the opening of the Qinghai–Tibet Railway in China, currently the highest in the world, the highest three railways were located in the Andean countries of Peru and Bolivia. In the Alps, the Jungfrau Railway has the particularity of reaching an elevation that is higher than the local snow line.
While South Korea and China use standard 1,435 mm gauge track, Russia uses a gauge of 1,520 mm. The North Korean systems use a range of gauge widths, but 87 percent of its tracks are 1,435 mm.
Broad gauge of 1,676 mm (5 ft 6 in), commonly known as Indian gauge, is the dominant track gauge in India, Pakistan, Bangladesh, Sri Lanka, Argentina, Chile, and on BART (Bay Area Rapid Transit) in the San Francisco Bay Area. This is the widest gauge in common use anywhere in the world.
The gauge, know as “standard gauge” (4' 8.5?) is standard throughout much of Europe, though the US and Russia use wider gauges. Many former colonial countries use a narrower 3'6? gauge, however.