Crews have begun working to untangle tracks at the junction where the Cranbourne and Pakenham lines merge.
Speed restrictions at this section of the rail line, in Dandenong, have caused trains to slow down as they move towards the junction.
Once works on the Cranbourne Line are completed in 2023, the new parallel tracks will increase reliability making it easier for trains to run to the timetable.
These upgrades will allow trains to run six times an hour on the Cranbourne line.
By 2025, the Cranbourne line will be the first metro train line to be completely level crossing free.
The line will be fully duplicated by 2023 as crews will build eight kilometres of new track and duplicate two rail bridges along the route.
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- Final level crossing removal dates announced for Cranbourne line