The UITP definition of a Metro is- 'an electrically powered train operating on reserved tracks in urban areas.' In 2014, 156 cities around the world had a metro system in operation. Nearly two thirds of these networks are located in Asia and Europe, 54 and 46 respectively. There are 18 systems in Latin America, 16 in both Eurasia and North America, and 7 in the Middle East and North Africa or MENA region. The last 15 years have seen a considerable expansion in terms of metro systems and infrastructure. A total of 194 metro lines for both existing and new networks, accounting for approximately 40% of the length of metro infrastructure worldwide, have been inaugurated in this period. In total, 53 new metro systems have been built and put into operation since the turn of the millennium. In 2014 alone, 513 km of new infrastructure and 355 metro stations were put into service. New metro systems were inaugurated in Salvador (Brazil), Changsha, Ningbo and Wuxi (China), Mumbai (India), Shiraz (Iran) and Panama City (Panama).
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