Three shifts. According to official website of Chengdu Metro, the security inspection classes of Chengdu Metro Line 6 are divided into three shifts: morning shift at 7- 15, middle shift at 0-5-23 and night shift at 23-7. Chengdu Rail Transit Group Co., Ltd. is an important state-owned enterprise responsible for the investment, construction, operation and resource development of Chengdu rail transit. The registered capital of the company is 6.7 billion yuan.