North-East Line services between HarbourFront and Dhoby Ghaut Stations in both directions were down on Thursday due to a power fault.
The fault started at 9.51am on Thursday morning which caused a delay on the line. Engineers then traced the fault to wires in the overhead power system in a section of tunnel between Outram Park and Harbourfront. To enable repair work, train services were disrupted at 10.14am.
Shuttle buses have been activated to provide commuters with alternative transport. Affected commuters can also get free rides on bus services serving designated bus stops at affected stations.
SBS Transit in a statement said it apologised to all affected commuters for the inconvenience caused and hoped to get the line up as quickly as possible.