The Mandurah Train Line has re-opened after a 20-day shutdown.
Almost 500 contractors worked around the clock, laying more than 5km of new track, re-laying 7500 concrete railway sleepers and installing new overhead line equipment as part of the new METRONET Thornlie-Cockburn link.
With trains back up and running, replacement bus services have now stopped, with thousands of bus trips provided and around 140,000 passenger boardings recorded over the course of the shutdown.
"The biggest public transport shutdown on the Mandurah Line is now over thanks to the hard work of METRONET's contractors, and I would like to thank them for getting the job done in extreme weather conditions," Transport Minister Rita Saffioti said.
"Thank you to our residents and passengers for your patience and everyone who has been involved in continuing to provide a public transport service during the shutdown in often challenging conditions, including the hundreds of bus drivers drafted in to support the train replacement effort."
Now the Mandurah Line track has been shifted, work continues to build the Thornlie-Cockburn Link.
The next steps are to construct the new Thornlie Line in the centre of the passenger rail corridor between the Glen Iris Rail Tunnel and Cockburn Central Station.
Progress will continue on the construction of Ranford Road Bridge and the relocation of the Kewdale White Oil Line through Thornlie, Canning Vale and Jandakot to make way for the new train line.