Train services on North-South line have been resumed as Singapore Mass Rapid Transit (SMRT) is gradually making improvements, following hours-long breakdown.

The latest update at SMRT website shows that train services on the whole North-South line resumed at 1.48pm on Saturday.

The website also states that it had removed five defective trains from the tunnel. Passengers who had stuck in one train in the tunnel had to walk through the tunnel to the nearby station.

The breakdown disrupted service between Ang Mo Kio and Marina Bay, starting about 7.00 am. It was the third breakdown this week. The Saturday disruption erupted just a day after SMRT chief executive apologized for the Thursday's service disruption.

Earlier on Thursday, a misalignment between the train track and the so-called collector shoes, which are used by trains to draw power, had disrupted the service.

The Thursday disruption had affected as many as 127,000 passengers.

Mr. Goh Chee Kong, senior vice president of communications & services at SMRT, said that the cause of the latest disruption could be similar to the fault that disrupted the service on Thursday.