2015 MRT disruptions

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This article refers to the MRT disruptions occurred on 7 July 2015 on the North South Line and East West Line cocurrently.

On 7 July 2015, train services were disrupted between 7.15 pm to 10.35 am throughout all 54 stations on the North South East West Lines affecting 250,000 commuters[1], making it the worst breakdown since it's operation in 1987.[2] Up to now, SMRT and LTA are still finding out the root cause of the power trip on 7 July 2015.[1]

Incident Timeline

Date Time Event
7 July 2015 17:59 1st power trip reported.
18:03 20 instances of power trips reported network wide.
Bus-Bridging on standby.
18:52 1st power trip cannot be reset. 5 trains had stalled since.
19:06 2 more power trip cannot be reset.
19:28 Free bus service activated.
19:34 All train service suspended.
21:00 East West Line resumes with degraded service.
22:35 North South Line resumes with degraded service.
8 July 2015
02:10 Free bus service creased.
05:30 North South East West Lines running as per normal with degraded service. North South Line may be suspended later in the day.
02:10 Free bus service activated.
10:33 No suspension on North South Line due to no incident report during the morning peak hour.
12:00 Free bus service creased.

Possible Cause of Power Trips

LTA and SMRT identified three possible causes of power trips.[3]

  • A train was detected to have an arcing problem, but no evidence shown that it was the root cause.[4]
  • Two power insulators damage were detected along the North South Line.
  • At Kranji Station's power station was detected to have "No Voltage Relay", problem has been rectified.
  • Tanjong Pagar Station track detected water leakage near power supply, apparently damaged insulators. Insulators have been replaced.


  1. 1.0 1.1 "Root cause of NSEW Line disruptions still not identified: LTA". Channel NewsAsia (9 Jul 2015). Retrieved 9 Jul 2015.
  2. "MRT breakdown: North-South, East-West lines down for hours". Today Online (7 Jul 2015). Retrieved 9 Jul 2015.
  3. "3 possible causes for Tuesday's train breakdown; investigations ongoing". The Straits Times (8 Jul 2015). Retrieved 9 Jul 2015.
  4. "Faulty train could have caused power trip: LTA on North-South, East-West line disruptions". Channel NewsAsia (7 Jul 2015). Retrieved 9 Jul 2015.
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