Trains on the Mandurah Line will be cancelled nightly from Monday between Cockburn and Mandurah stations.
From tonight until Thursday May 24 trains running between Mandurah and Cockburn will be cancelled.
The last full-line service will depart from Perth at 7.53pm and from Mandurah at 8.19pm.
Transperth said train replacement bus Route 909 will run while trains are cancelled.
Route 909 will operate between Cockburn and Mandurah stations, but due to space restrictions bicycles would not be permitted on replacement buses.
Trains will resume with the start of timetabled services each morning.
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