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Joo koon rail accident

The meaning of «joo koon rail accident»

The Joo Koon rail accident, or sometimes referred to as the Joo Koon train collision, was an accident which happened on 15 November 2017, when a C151A train travelling at 16 kilometres per hour (9.9 mph) rear-ended a stationary C151A train at Joo Koon station on the East West MRT line, resulting in 38 injuries.[2][3] The stationary train was in the process of being detrained due to a train fault. Both trains were operating under the recently installed Thales SelTrac CBTC signalling system at time of incident, and the Minister of Transport Khaw Boon Wan expressed that he was "disturbed" by an initial finding that "critical safety software" was inadvertently removed from the stationary train, possibly due to a malfunctioning signalling circuit, which led to the accident.[4] This incident is the second train collision in Singapore MRT's history, after the Clementi rail accident.

The East West MRT Line, at the time of the incident, was in the transition process between the older Westinghouse ATC fixed block signalling and the newer Thales Group SelTrac CBTC moving block signalling.[4] Both systems are in use on the same line, but only the newer CBTC signalling equipment was available for the Tuas West Extension between Joo Koon and Tuas Link.[4][5] As a result, trains are required to switch from the Westinghouse signalling to the Thales signalling at Pioneer prior to heading towards Tuas Link, and vice versa in the other direction.[5]

There were previous high-profile train disruptions in June 2017 during the testing phase on the North South MRT line, when it was transitioning to the Thales SelTrac CBTC.[5] Those incidents were found to be a result of human error when new software was being installed.[5] Before this accident, SMRT had originally scheduled full-line testing of Thales CBTC to begin on the East West Line in December 2017.[5]

The first train, a Kawasaki-Sifang C151A bound for Tuas Link, had to be removed from service due to a train fault at 8.18am caused by a separate signalling fault.[1][6] The second train, another C151A, bound for the same terminus, stopped behind the first train while the automatic platform gate was manually overridden to allow the detrainment of the first train.[1][6] The second train had 517 passengers on board.[2] As the doors of the first train were closed, the second train suddenly accelerated to a speed of 16 km/h and rear-ended the first train.[2] Witnesses outside the train reported hearing a loud bang.[7] This resulted in 38 injuries, including two SMRT Trains staff members.[2] Many of the injuries resulted from passengers losing balance and impacting the floor or fixtures, and ranged from vomiting to a broken tooth.[2][7] The injured passengers and staff were treated at National University Hospital and Ng Teng Fong General Hospital.[3]

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