[1] Between Chengdu South Railway Station and Western China International Expo City Station, the line runs adjacent to Line 1 essentially forming a four track subway.

[4] The section from South Railway Station to Sancha started operation on 27 September 2020.

The rolling stock have features designed for medium distance travel, such as a 140 km/h maximum speed and wide station spacing.

The local service will stop at all stations on Line 18 and will complete the trip in 40 to 50 minutes.

[7] On December 9, 2019, the Department of Ecology and Environment of Sichuan Province approved new extensions for Line 18.