A train decoupling accident occurred on the MTR Tseung Kwan O Line on December 5 last year. The government restricted MTR to submit an investigation report no later than tomorrow (4th).
MTR released an investigation report today, indicating that the investigation revealed that a ring used to fix the buffer in a semi-permanent coupler device in the sixth car of the train was loose, causing the buffer to shift in the internal structure of the coupler. The aisle between the cars appears to be stretching abnormally.
According to the investigation report, the workshop passage between the two trucks was still connected at the time of the accident, and the train did not deviate from the track.
The committee believes that the most likely cause of the loosening of the collar is that the original factory did not effectively use the screw fixing agent (Loctite) on the thread, so that the collar could not be permanently fixed, and after many years of use, the collar became loose.
As for the coupler device, the MTR has established a maintenance system for regular preventive inspections and regular overhauls. However, because the buffer is a proprietary design, the buffer manufacturer conducts a major overhaul about every nine years. No anomalies were found in the accident buffer when it was last overhauled in 2018.
The committee believed that the company had arranged for the original factory overhaul of the buffer according to the specific requirements of the coupler device supplier.
▼MTR Tseung Kwan O Line car card decoupling accident on December 5▼
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At around 8:30 a.m. on December 5 last year, a train on the Tseung Kwan O Line heading for North Point broke down when it was preparing to enter Tseung Kwan O Station. "Shipping card" situation.
Some passengers described that the train was suspected to be stopped by foreign objects, more than it seemed to be stopped. Afterwards, the lights of the involved cars were turned off, and they walked about 10 meters on the rails before returning to the Tseung Kwan O platform.
In the accident, about 1,500 passengers on the bus had to be evacuated and returned to the Tseung Kwan O platform on foot through the emergency ramp at the front of the bus. Two women, including pregnant women, felt unwell during the incident and were sent to the hospital for treatment.
The train service resumed at 12:30 noon, that is, during the delay of 4 hours, MTR arranged shuttle buses to pick up affected passengers.
The government asked MTR to submit a detailed report no later than February 4.
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▼12.5 Hundreds of people lined up at Tiu Keng Leng Station for the transfer of train cards at Tseung Kwan O Station▼
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Tseung Kwan O Line train suspension｜Coupler buffer "loosening" accident expert: loosening is very rare Tseung Kwan O Line train decoupling | It is the most dangerous failure: No casualties are caused by the decoupling of the Tseung Kwan O Line train｜Lin Shixiong ordered the MTR to thoroughly investigate the cause and condolences to two passengers who were sent to the hospital. The Tseung Kwan O Line train decoupling｜The service was blocked for about 4 hours
