A faulty platform screen door at Sixth Avenue Station along the Downtown Line (DTL) was caused by a bolt, which had loosened over time, said the Land Transport Authority (LTA) and SBS Transit (SBST) in a joint press release on Tuesday, the 18^th of October. The bolt on the fastener, which secures the affected platform screen door to the guide rail had loosened over time, causing the door to be misaligned and come into contact with the side of an approaching train. The dislodged screen door disrupted train services for two hours on the morning of 4^th October.

The platform screen doors at Sixth Avenue station were last checked by SBST in August as part of its routine maintenance, and none were faulty, according to the press release. Following the 4^th October incident, however, all DTL platform screen doors, including bolts and securing mechanisms, were extensively inspected and found to be functioning normally. Platform screen doors on the other rail lines were also inspected, and found to be secure and in good working condition.

Following the incident, LTA and SBST have worked with the original equipment contractors to enhance the design of the platform screen door fasteners at all DTL stations. A self-locking nut and a retaining pin will be added as additional measures to better secure the fastener to the guiding rail. The enhancement works to the doors are expected to be completed in the next two weeks. All platform screen doors for the upcoming DTL3 will also use this enhanced fastener design. The press release also said that more specific checks on all DTL platform screen doors will be done as part of routine maintenance.