There will be no trains running at night on the Mandurah line between Perth and Cockburn stations from July 30 until August 3.
The last full-line services on Sunday night will be departing Perth at 7.45pm and Mandurah at 6.49pm.
The last full-line services Monday to Thursday nights will be departing Perth at 8.08pm and Mandurah at 7.27pm.
Services on the Mandurah line are being cancelled nightly between Perth and Cockburn stations in order to facilitate maintenance works.
Train replacement bus Route 909 will run instead.
Passengers travelling on to Joondalup should also note trains will be leaving from Platform 6 once the closure is operating each night, instead of continuing on from the Mandurah service.
The advice is to allow extra travelling time and be aware that replacement buses may not connect with timetabled bus and train services.
Transperth is also reminding passengers that surfboards and bicycles are not permitted on Transperth buses.
Trains will resume with the start of timetabled services each morning.
For assistance or to plan your journey please call the Transperth InfoLine on 13 62 13.