A train fault at Raffles Place station delayed eastbound train services on the East-West Line on Friday evening.
In a tweet at around 7.30pm, SMRT said: "Due to an earlier train fault, estimate 20 minutes additional travelling time from Bugis towards Pasir Ris."
Train faults delayed services further down the line. Commuters reported huge crowds at train plaforms at several stations.
Commuter M. Lim, 50, said he was asked to alight from the train he was on at Bugis.
He had boarded the train at Bedok towards Newton, and said the Bugis station platform was very crowded.