Portugal announced the preliminary investigation report on the cable car crash in Lisbon in September on the 20th,The accident was determined to be caused by multiple "serious negligence", including braking system failure, violations and fraud¡£

According to the report of the Portuguese Office for Aviation and Railway Accident Prevention and Investigation, the cable of the cable car accident is insufficient and there is a quality defect. After the steel cable is broken, the cable car safety system disconnects power, causing the air braking system to fail.

The report also said that the Lisbon City Public Transport Company, which operated the accident cable car, hastily purchased steel cables that did not meet standards in 2022 and did not install them according to the manufacturer's instructions. In 2024, the company will continue to use the same steel cable, which was in use for less than a year when the accident occurred.

In addition, there are vulnerabilities in cable car maintenance as well.Since 2019, the contractors responsible for cable car maintenance have been lacking the company and professional engineers to work under the supervision, with more maintenance records and actual implementation.

The cable car is an important mode of transportation for Lisbon residents and a landmark attraction, attracting a large number of tourists to experience it. The cable car line was built in 1885 and the cable car runs along the hillside. On September 3, a cable cable broke on the cable car on the line, killing 16 people and injuring more than 20 others.

The Office for Aviation and Railway Accident Prevention and Investigation said that the preliminary investigation report does not involve the identification of responsibility, the specific causes of steel cable rupture, whether the cable car braking system needs to be improved, etc. The final report is expected to be released next year.