Commuters on the North-South and East-West MRT lines experienced delays yesterday, due to three separate service disruptions.

Train services in both directions between Boon Lay and Joo Koon stations on the East-West Line were down for about an hour from 8.45am to 9.40am because of a track fault.

Then at 8.58am, the rail operator tweeted that another track fault had occurred on the North-South Line, and that commuters could expect an extra 10 minutes of travelling time between the Yishun and Woodlands stations. Service on the line resumed at 9.19am.

Free bus services between Boon Lay and Joo Koon were made available to those affected by the breakdown on the East-West Line.

In addition to the morning service delays, there was a disruption at lunchtime between Ang Mo Kio and Admiralty stations.

An SMRT tweet at 1.25pm advised commuters that they could expect an additional travelling time of 15 minutes between Ang Mo Kio and Admiralty stations heading towards Jurong East. Services were restored 22 minutes later.

The Straits Times understands that the delay was due to rectification works for the morning incident at Admiralty.

SMRT apologised to commuters affected by the service disruptions and said the loss of power to trackside signalling equipment had caused the interruption between Joo Koon and Boon Lay.

"This caused two west-bound trains to be held between Pioneer and Joo Koon stations," said SMRT spokesman Patrick Nathan, adding that power engineers were "quickly deployed" to restore power to the affected stretch.

The cause of the power fault was being investigated, he said.

Meanwhile, the delay on the North-South Line was caused by a "track point failure" near Admiralty station, which prevented trains from moving from one track to another. Instead, personnel on the track had to manually allow the trains to switch tracks.

"As a precaution, trains were travelling over the affected point at slower speeds to ensure the safety of our passengers," said Mr Nathan, adding that the incidents on the two lines were not related.

Last Thursday, a train on the Bukit Panjang LRT line operated by SMRT failed to stop at three stations because of a faulty antenna.

A day later, a train fault at Buangkok station caused a 50-minute disruption between Punggol and Potong Pasir stations on SBS Transit's North East Line.