Train service on the North-South Line was delayed on Sunday morning after a southbound train had an electrical failure.

In a statement on Facebook, SMRT said the fault was caused by lightning that struck somewhere around the Kranji station area during the morning thunderstorm.

The affected train stalled at Woodlands MRT at about 6.40am and was later pushed back to the depot by another empty train.

SMRT said the incident caused a delay of about 35 minutes and affected some 3,500 passengers.