Chongqing, one of China's four direct-controlled municipalities, is located in southwestern China along the confluence of the Yangtze and Jialing Rivers. Known for its mountainous terrain, hot and spicy cuisine, and rapid urbanization, Chongqing has developed into one of China's largest and most densely populated cities. Due to its unique topography, building a comprehensive rail and transit system has been both a challenge and a necessity. 

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