The first phase of Chongqing Rail Transit Line 15 starts at Jiuquhe East Station and ends at Liangjiang Film City Station. The project is approximately 38.7km in length, with 14 stations and a total track laying length of 103.724km, including 89.812km on the main line. A LDT16 type 16-ton subway track laying machine, with a span of 5.2 meters, is used. This machine ensures smooth operation and reliable braking.