Dec 15 and 17, 2011
A sagging power-supply rail brings the North-South Line to a standstill on the evening of Dec 15, and then again on the morning of Dec 17, as SMRT fails to detect and rectify the damage completely.
July 7, 2015
A power-supply trip causes both the North-South and East-West lines to fail, affecting about half a million commuters.
The Land Transport Authority later blames a salt-caked insulator near Tanjong Pagar station, but is unable to replicate the fault.
April 25, 2016
A power trip at one of the network's substations causes the western sector of the North-South and East-West lines, parts of the Circle Line, as well as the Bukit Panjang LRT system to fail. The trip is suspected to have been triggered by cable works on the East-West Line's Tuas West Extension.