Yahoo! Singapore News, 14 Dec 2011
About 1,400 Circle Line commuters were affected by delays in train services due to a communication network problem during the peak hour on Wednesday morning.
SMRT said, in a press release, that train services were disrupted at 6am due to a fault on the Circle Line between Marymount and One North MRT stations in the direction of Harbourfront. Train service was partially restored by 6:40am. Full story