Fault in switchboards triggered shutdown
Preliminary investigations revealed that the disruption stemmed from a fault in the switchboards supplying power to the system.
LTA explained that there are two switchboards designed to back each other up.
Under normal circumstances, if one trips, the other continues supplying power from the main source.
Source: Land Transport Authority on Facebook
During Tuesday’s incident, however, the first switchboard was damaged, and the resulting surge triggered a safety feature that automatically shut down the second switchboard to prevent further harm.
This chain of events effectively cut off the main power supply from Sengkang Depot.
Backup power restored & services resumed
To resume train services, SBS Transit engineers manually connected the backup power source from Dhoby Ghaut to the second switchboard.
Services were progressively restored, with full NEL and Sengkang-Punggol LRT operations resuming by the following morning.
Source: Land Transport Authority on Facebook
In the aftermath, LTA and SBS Transit are reviewing ways to strengthen the resilience of the power system.
Support for commuters during the disruption
While engineers worked to restore power, SBS Transit provided free rides on public buses and bridging bus services for affected sectors.
Train services between HarbourFront and Farrer Park stations continued to operate.
Source: Land Transport Authority on Facebook
Around 350 LTA and SBST staff were deployed to guide commuters to alternative transport options, while the Singapore Civil Defence Force (SCDF) assisted passengers in safely disembarking from trains and reaching station platforms.
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Featured image adapted from Land Transport Authority on Facebook and Facebook.