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Throughout the history of the Mass Rapid Transit, there have been many incidents that occurred on its five lines, with every line being plagued with disruptions of various degrees of severity. The following lists the most major incidents on the system

Clementi rail accident
The 1993 Clementi rail accident was a rail accident that occurred on the East West line of the Singapore MRT. It was the MRT's first major incident and resulted in 156 passengers being injured. It was caused by a 50 L oil spill.

Before the start of service, a maintenance vehicle leaked oil onto the tracks from Buona Vista MRT station to Clementi MRT station until the junction with Ulu Pandan Depot. The first 10 westbound trains reported braking difficulties. The eleventh train, a C151, had to use its emergency brakes to stop at the station. At 7.50 am on 5 August 1993, the 12th train, another C151, collided with the stationary C151 at Clementi while it was recharging its batteries, resulting in 156 injuries.

Nicoll Highway collapse


The Nicoll Highway collapse was a construction accident that occurred at approximately 3:30 p.m. Singapore Time (UTC+8:00) on 20 April 2004 in Singapore when a tunnel being constructed for use by MRT trains collapsed. The tunnel was part of the construction of the underground Circle Line, near Nicoll Highway station. The supporting structure for the deep excavation work failed, resulting in a 30-metre (100 ft) deep cave-in that spread across six lanes of Nicoll Highway. The collapse killed four people and injured three. The accident delayed the construction end date for Circle Line stage 1.

Pasir Ris rail accident
The Pasir Ris rail accident occurred at 11.10am on 22 March 2016, where a team of 15 track personnel were deployed to a track switch near Pasir Ris MRT station to investigate a high voltage alarm that indicated a possible signalling fault. The team of 15 track workers walked in a single file towards the signalling equipment to investigate the problem, and was granted track access. The two deceased workers, Nasrulhudin Majumudin and Muhammad Asyraf Ahmad Buhari, were second and third in the team walking as a file on the sidewalk near the third rail. Both of them were trainees in SMRT Trains. No speed restriction or ATC-code restriction was imposed on that section of track and there was no railway watchman to warn train drivers of the presence of workers on track. The incident train, trainset 073/074 (a Kawasaki Heavy Industries C151), was in automatic mode under Westinghouse ATC and accelerated up to a speed of 60 km/h.

The two deceased personnel, one supervisor, and at least one more track worker crossed over the third rail and onto the track to access the signalling equipment. A senior officer in the team then noticed the train and yelled "train is coming! Train is coming!". Members of the team tried to jump back into the sidewalk to seek refuge. The train driver noticed the track workers and tried to apply the emergency brakes. However, the train struck both Nasrulhudin and Muhammad Asyraf. Nasrulhudin was crushed under the train, while Muhammad Asyraf, who was impacted by the train, flew 5 metres in the air. Both personnel suffered multiple injuries and were pronounced dead at the scene. Service between Tanah Merah and Pasir Ris was suspended as a result for 2.5 hours, affecting 10,000 commuters.

Joo Koon rail accident
[[File:SMRT Siemens C651 train at Joo Koon MRT Station, Singapore - 20160418-02.jpg|thumb|left
 * Joo Koon MRT Station, where the accident took place]]

On 15 November 2017, a C151A train travelling at 16 km/h rear-ended a stationary C151A train at Joo Koon station on the East West MRT Line, resulting in 38 injuries. 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. This incident is the second train collision in Singapore MRT's history, after the Clementi rail accident.

Refrences
Category:Mass Rapid Transit (Singpore) Incidents