Multiple Warrnambool line faults threw its schedule out on Monday morning.
Two train services were replaced by coaches and one was almost an hour late on Monday due to faults.
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V/Line confirmed a fault on the locomotive due to run the 9.05am service from Warrnambool to Southern Cross impacted on the 7.20am service running in the opposite direction.
Both services were replaced by coaches, and a V/Line spokeswoman said the locomotive should be in service again Tuesday.
The 5.55am service from Warrnambool was delayed by 40 minutes due to a track fault near Winchelsea.