The gauge for the most of the China national railway network is standard gauge. Currently, in the national railway network, only the 1,000 mm (3 ft 33/8 in) metre gauge Kunming–Haiphong railway uses narrow gauge.
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Some 60% of the world's railways use the standard gauge of 1.4 m (4.7 ft). Gauges vary by country and sometimes within countries. The choice of gauge during initial construction was mainly in response to local conditions and the intent of the builder.
If locomotives were imported from elsewhere, especially in the early days, the track would be built to fit them. In some cases standard gauge was adopted, but many countries or companies chose a different gauge as their national gauge, either by governmental policy, or as a matter of individual choice.
It mandated the track gauge with a width of 1435 mm to be the standard for Great Britain. At that time, the UK was the only one capable of exporting railway rolling stock. As a result, the vast majority of railways in Europe adopted the 1435mm gauge.
Some countries such as the Netherlands have modified their track gauge, but in Spain it is still used, except on high-speed lines, where the European international track gauge of 1435 mm is used, as opposed to the Iberian gauge of 1668 mm.
If you're planning to travel around Spain, in addition to buses, you should consider taking a ride on one of the country's high-speed trains. Spain's high-speed rail system is one of the best in the world, as it offers travelers a fast and convenient way to explore this gorgeous Mediterranean country.
Germany has rail links with the following countries. All are to countries of the same gauge (1435 mm), although electrification (15 kV AC 16.7 Hz) and other systems such as signalling may differ.
The rail network of Switzerland is one of the densest and spectacular in the world. It covers a total length of 5063 km of lines with 3652 km on international gauge 1435 mm, 1312 km on metre gauge and 68.5 km of 800 mm or 750 mm gauge.
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.
Railroad infrastructure quality - Country rankingsThe highest value was in Japan: 6.8 points and the lowest value was in Albania: 1.2 points. The indicator is available from 2009 to 2019. Below is a chart for all countries where data are available.