Train services between Mandurah and Rockingham stations will be cancelled over the weekend in order to facilitate works on the new Lakelands Station.
The last full service will depart Perth Underground at 9.23pm on Friday and 9.49pm from Mandurah.
Trains will continue to run between Rockingham and Perth Underground with full services resuming on Monday morning.
Replacement bus 909 will be in operation between Mandurah and Rockingham stations during the weekend.
Passengers should allow extra travelling time and be aware that replacement buses may not connect with timetabled bus and train services.