MTR Yau Ma Tei slams the door｜The metal guardrail is exposed due to water seepage in the tunnel, the screws are corroded and loose, and the maintenance is lacking

MTR announced today (12th) the investigation report on the incident of a train derailed and knocked off the door at Yau Ma Tei Station on November 13 last year. At the time of the incident, 12 sets of bolts and nuts on a metal guardrail were tilted and entered the train path due to "serious corrosion". , causing the train to collide and derail.

The report also acknowledges that the MTR has not properly maintained the metal guardrail and has not arranged maintenance guidelines for its inspection.

MTR stated that it will conduct a comprehensive review of trackside structural installations and related facilities, as well as a comprehensive asset management review, including reinforcement or replacement of 57 guardrails of similar nature, and targeted repairs at the same time.

▼On November 13, MTR personnel carried out emergency repairs after the train derailed▼

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On November 13 last year, a train door slammed and derailed at Yau Ma Tei Station. The incident occurred when the train collided with a metal guardrail that was permanently fixed on the side of the track, causing the front axle of the first truck to deviate from the track and two pairs of doors to shift.

In addition, during the period, some passengers opened the emergency exit ramp at the rear of the train by themselves and walked along the evacuation path beside the track to Mong Kok Station.

Metal guardrail comes loose due to 'severe corrosion'

Two months later, MTR released a formal investigation report, which mentioned that 12 sets of bolts and nuts fixing the metal guardrail components involved were severely corroded due to water seepage in the tunnel, while there were no exposed gaps and bolts inside the foundation. Extensive corrosion caused the bolts to be unable to be fastened to the ground, so that the metal guardrail could not be fixed on the ground and its structure was unstable. When the two sets of corroded bolts on the tunnel wall broke off, the metal guardrail tilted and entered the path of the train. scope.

The report also pointed out that since the metal guardrail and its components are permanently fixed structures, they are not directly related to daily train operations.

Guardrails are free standing structures that do not need to support any loads, structures or equipment and are not common in railway networks.

The investigation committee believes that the MTR's "asset management system" is "not refined enough" in the classification of civil structures, and has not included such metal guardrails. Maintenance instructions for its inspection.

Firefighters were there.

(Photo by Cai Zhengbang)

The front of the train involved in the accident was damaged (pictures on the Internet)

The maintenance personnel knew that there were steel corrosion and concrete spalling problems nearby that affected the operation of the train.

In addition, due to the current inspection of civil structures, it mainly focuses on dealing with structural problems such as concrete spalling caused by water seepage, as well as the impact on key equipment for train operation.

Therefore, although the maintenance personnel have discovered and followed up the steel bar corrosion and concrete peeling problems that obviously affect the operation of the train, the impact of water seepage on the guardrail has not attracted the maintenance personnel's special attention, and no one has reported it.

The report also showed that when the passengers on the train were evacuated that day, the carriage broadcast failed to clearly express the arrangement for passengers to be evacuated from the carriage to the Yau Ma Tei station platform, and because the control wires on the train were damaged in the accident, the train captain could not immediately know that there were passengers The rear emergency exit ramp has been opened.

The investigation committee recommends adding a new function to all trains, that is, when the emergency exit ramp is used, the train will send an alarm directly to the train operation control center, and also strengthen the training of the train control center and train personnel, and use it during accident communication "Standard language", more effective notification of passenger evacuation arrangements, and enhancement of passenger information release at stations during accidents, and review of free shuttle bus routing arrangements.

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