Standardization of CBTC Systems – Mixed Operation on Shared Lines in accordance with ERTMS/ETCS Standards
نویسنده
چکیده
The numbers are self-explanatory. In 1800, only three percent of the world’s population lived in cities. 2007 was a milestone in human history: for the first time ever, more people on earth lived and worked in cities than in rural areas. The UN estimates that the proportion of city-dwellers will climb to 61 percent by 2030, pushing up urban population from three billion today to a total of five billion.
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