Buses will replace trains on the Werribee line between Newport and Laverton due to a fault.
Delays are likely as buses will take over 60 minutes to arrive.
Passengers are asked to check station platform displays and listen for announcements.
VicRoads’ signals team is monitoring road conditions and will adjust traffic lights as needed to minimise congestion and assist with bus movements in the area.
Details: ptv.vic.gov.au