Chongqing rail transit refers to the urban rail transit system serving Chongqing metropolitan area. Chongqing has opened 1, 2, 3, 4, 5, 6, 9, 10 lines, loop lines, cross-river lines and * * *1rail transit lines. The network covers many districts in the main city of Chongqing, with a mileage of about 478 kilometers. Chongqing Rail Transit Map-