Three- and six-car trains will operate at a low speed before increasing their speeds by the end of the month.
Signals and tracks will be tested and drivers trained.
The Butler station is expected to be open in late September.
PerthNow Digital Edition.
Your local paper, whenever you want it.Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOWThe Public Transport Authority plans to release the station opening date and train and bus timetables in mid-August.
– Did you know? The train ride to Perth from Butler is expected to take 37 minutes.