This aerial photo taken on Dec. 28, 2023 shows a train of Chongqing Rail Transit Line 18 passing on a bridge in southwest China's Chongqing Municipality. Chongqing Rail Transit (CRT) Line 18, which is 29 kilometers long and has 19 stations, officially started initial operation on Thursday. So far, a total of 13 rail transit lines are in operation in the city with an operating length reaching 538 kilometers. (Photo by Luo Bin/Xinhua)
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