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Chongqing Rail Transit Circle Line is the eighth urban rail transit line opened for operation in Chongqing, China, with an operating mileage of 50.80 km and 33 stations, which is a set of rail transit lines connecting railways, highways, waterways and air transport, and is an important rail transit line to alleviate Chongqing's traffic congestion, enlarge the urban skeleton, optimise the layout of urban structure, promote the overall development of the main city, and connect the main city clusters and transport hubs.