Buses are replacing trains on the Sunbury Line between Sunshine and Watergardens stations, due to a police incident near Albion.
The Department of Transport urged passengers to consider using local buses on route 420 to connect between Sunshine and Watergardens.
“We ask passengers to check station platform displays and listen for announcements, and to allow up to an additional 60 minutes for their journey,” the department said.
Authorised Officers will assist passengers transferring between trains and buses at Sunshine.
The department said trains services will resume when police investigations are complete.
The VicRoads signals team is monitoring conditions and will adjust traffic lights as needed to minimise congestion and assist with bus movements in the area.
Real-time traffic conditions are available at traffic.vicroads.vic.gov.au or via the VicTraffic mobile app.
The latest public transport information and network status is available at ptv.vic.gov.au or in the PTV mobile app.