58,000 commuters were affected during the nearly seven-hour North East Line (NEL) train disruption on Thursday, reported Channel News Asia.
Service between HarbourFront and Dhoby Ghaut stations was down from 10am to about 430pm when full service resumed.
In a statement, the transport operator said the fault occurred at 9:51am and that the fault had been traced to three broken U-turn bolts which resulted in a power trip in a section of the tunnel between Outram Park and HarbourFront.
Last August, a similar fault occurred at the same stretch. SBS Transit has decided to replace all 1,900 U-bolts in the tunnel following Thursday's incident. Full story
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