Thousands of commuters were stuck between 15 minutes to over an hour during a a major delay on the MRT along the East-West line on Thursday morning.
The cause is still being investigated but an announcement by the SMRT on one of the trains said it was due to a "faulty train between Tiong Bahru and Outram".
The delay during peak hour morning traffic caused many on their way to school or work to be late.
Public relations executive Felicia Goh, 24, told Yahoo Singapore she was been stuck on the train for more than an hour.
"I was initially stuck at Clementi before moving two stops and stalling again at Buona Vista," she said.
Undergraduate Jacqueline Wong, 22, was at Buona Vista station and after waiting for 15 minutes on the train and seeing tweets on micro-blogging platform Twitter about the train delay, she got off and took a bus instead.
Her mother was not so lucky. She took one hour and 2o minutes to get from Buona Vista station to Outram Park, reaching work two hours late, said Wong.
Frustrated commuters took to Twitter to complain about the crawling train service and warned others to skip the train ride this morning.
@Redha E tweeted, "I think the delay affected a lot of places. Lots of grumpy people at Bugis MRT tation when i got down just now."
Said @fumblies, "Thanks to the lengthy train delay, I get my much needed sleep on the stationary mrt + an excuse to be super late for lecture."
When contacted, SMRT said it will be releasing a statement soon.
On Sunday, a train was delayed at the Ang Mo Kio station after a Thai teenage girl fell onto the tracks and was hit by a train.