Jump to the content zone at the center

Taipei City Goverment

City News

Major Causes of Malfunctioning MRT Doors Have Been Revealed!

prevent their beloved ornaments or personal belongings from getting stuck in the door According to statistics from Taipei Rapid Transit Corporation (TRTC), over half of the door malfunctions of MRT trains has been attributed to foreign objects getting stuck in the door. For instance, of 65 door malfunctions in 2017, 33 were caused by foreign objects. In 2018, there were 62 door malfunctions, and 37 were caused by foreign objects. Further analysis indicates that the most common foreign object to cause door malfunction are backpack ornaments, therefore the company urges passengers to move inward as much as possible after entering the train, carry their backpacks instead of wearing them, and keep an adequate distance from the door in order to prevent their beloved ornaments or personal belongings from getting stuck in the door!

The doors of MRT trains open and close approximately 1.22 million times a day, and on average only one door malfunction occurs every 7 million times the doors open and shut. Taking 2018 as an example; a total of 62 door malfunction incidents occurred, which is equivalent to one door malfunction every 6.97 million times. However, among the 62 incidents, 37 were not related to equipment failure, but rather foreign objects.

When the door is not functioning properly, a persistent alert sound can be heard. The door lights and door open indicator lights remain illuminated, and the driver will immediately notify the Operations Control Center. The station master will reach the platform quickly to examine the malfunctioning door. If foreign objects are discovered in the groove, they will be removed straight away using the door groove foreign object removal tool.

However, if the foreign object is too small or lodged in too tightly, there is nothing the station master can do but ask all the passengers to disembark and wait for the next train. In the meantime, the malfunctioning train will head back to depot for further inspections.

All sorts of foreign objects have fallen inside the door grooves, with small ornaments on backpacks being the most common. Other personal belongings such as buttons, pencils, umbrella tips, combs, and lip balms can trapped in the door groves can result in door malfunctions.

Each door on MRT trains undergoes regular maintenance and testing to ensure that it is functioning optimally. The checks are divided into daily, monthly, biannually, annually, triennially, and once every 6 years. The items checked include the opening and closing function of the doors, door mechanism, door locking, door closing alert sound volume, and others.

When the door encounters a foreign object, it will perform a reopen procedure. In order to ensure the normal functioning of the reopen procedure, TRTC conducts tests every month using simulated foreign object measuring devices that range from rods of 20mm diameter to 10mm thick slabs. The purpose is to make sure that the door will reopen after encountering foreign objects of varying shapes and thicknesses.

To minimize the chance of foreign objects falling into the door grooves, passengers are reminded to move inward as much as possible after entering the train, carry their backpacks instead of wearing them, and keep an adequate distance from the door. Furthermore, please keep your personal belongings with you at all times in order to maintain smooth operation of the doors.

For related information, please contact TRTC's 24-hour customer service hotline (02) 218-12345, 1999 Taipei Citizen Hotline (for callers outside of Taipei, please dial 02-27208889) or the company's website (http://www.metro.taipei/).