Southbound train services between Ang Mo Kio and Bishan have been delayed on Sunday following a damaged rail joint.
In a statement on SMRT's Facebook page, the train operator said it was informed at 6am that an insulating rail joint between the two stations had been damaged. Such joints provide insulation along the running rail between two track circuits.
SMRT engineers have restored the track circuits to prevent further damage to the joint, which will be replaced after operation hours on Sunday night.
Passengers are being advised to add four minutes to their travelling time between the two stations in Sunday.
Southbound trains (towards Marina Bay) between Ang Mo Kio and Bishan MRT stations are now running at 18kph to ensure system and passenger safety, SMRT added.