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Chengdu Metro Line 18 is the eighth metro line to be opened for operation in Chengdu, Sichuan Province, China. It is an express line serving Chengdu between downtown and Tianfu International Airport, the first composite line in China that takes into account the central city passenger flow, urban area passenger flow, and airport passenger flow, and integrates multiple modes of operation organisation, and is the country's fastest urban area express line to move into the central city.