was designed to be 10 minutes. The system was expected to carry 1 million passengers per day. Some of the tracks were underground. Line A, Longmenhao – Ciqikou, 9 stations, Line B, Longmenhao – Nanwenquan, 7 stations, Line C, Longmenhao – Datiankan, 3 stations, 1958 attempt: "Yuzhong District Subway Engineering Unit" was started in late 1958, only to be suspended one year later. 1960 plan: A underground rapid rail transit system, linking the city center with Xinpaifang, Xiaolongkan, Yangjiaping, Shiqiaopu, Lianglukou, and other populated areas, was planned. 1965 attempt: The unit was reinstated. It has 4 units, including more than 1000 workers in total. Construction was stopped again in late 1966 by the Cultural Revolution. The unit was officially disbanded again in 1971. The completed tunnel sections were taken over by the civil air defense authorities. 1983 plan: A subway line (Chaotianmen – Yangjiaping) was planned. It is the precursor to today's Line 2. 1988 attempt: Some Hong Kong businessmen arrived to start a metro company in Lianglukou. The tunnel from previous attempts were extended. 1991 plan: A 4-line monorail system was planned. Official long-term plans 1998 plan: Has 5 lines in total, with a length of about . 2003 and 2007 plans: Two similar expansion including 10 lines, with a total length of about . Line 4 in the previous blueprint received a huge update and was renamed to Loop line, according to its new shape. 2011 plan: Features 8 new lines, with a length of about . 2019 plan: Target a 30-line network as of 2050, with a length of about . Commencement and expansions Incidents At around 14:00 of 8 January 2019, an improperly secured air defense lock was struck by an in service Loop line train, derailing it and causing serious damage to the cabcar. The accident injured three employees and one passenger. One of the employees, the driver, later died from their injuries shortly after being sent to the hospital. Technology Visual design Unlike most metro systems of other cities in China, CRT did not follow the design style of MTR Corporation in Hong Kong. The signage system was designed by GK Design Group in Japan, and the monorail lines are based on Hitachi Monorail technology. That gives the Chongqing Rail Transit a distinctive Japanese aesthetic, in contrast to other metro systems in China. CRT also gave each line a theme about the local culture,