Technical Glitch Caused Collision Of SMRT Trains: Singapore Authority

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Malaysian Digest – November 16, 2017

IMPACT: collision between two Mass Rapid Transit (MRT) trains that resulted in 28 people being injured

ROOT CAUSE: a software problem on one of the trains

ROOT CAUSE: a faulty signalling system … had inadvertently removed a software protection feature on the first of two trains… giving off a train profile on the new signalling system as a three-car train instead of a six-car train.

… the second train detected the first train as a three-car train and misjudged the distance between the two trains, therefore resulting in the collision

COMPANY RESPONSE: We are deeply sorry… let’s play doubly safe… we have a whole day to do a thorough check before we resume…