The 21-kilometre rail line is the state's biggest public transport project since construction of the Mandurah Line last year.

It includes new stations at Ellenbrook, Whiteman Park, Malaga, Noranda and Morley and will connect the fast growing north-eastern corridor to a re-developed Bayswater Station.

State Transport Minister Rita Saffioti says the Morley-Ellenbrook rail line is crucially important to residents in the north-eastern suburbs.

"Perth's north-eastern suburbs are some of the fastest-growing population areas in Australia but they are still without a train link. The Morley-Ellenbrook Line will change all of that," she said.

"However, this project is more than just a train line - it is about giving locals more options when choosing how they travel, where they work and where they want to live.

"The estimated boardings of more than 11,000 for the first day of service shows how needed this train line is."

The new stations will include parking for a total of about 3300 cars, four bus interchanges, universal access, cycle facilities, toilets and shared paths connecting them to the surrounding networks.

The Perth CBD will be as close as 15 minutes when boarding at Morley and just 30 minutes from Ellenbrook -- making it the quickest transport option available for nearby residents.

Integration with the Midland Line will also give passengers improved access to other destinations on the rail network, including Perth Airport.

Federal Minister for Population, Cities and Urban Infrastructure Alan Tudge said the extension will drastically alter how Perth's residents commute.

"Thousands of people will use this line from day one of operation, stripping cars off Perth roads and busting congestion," Mr Tudge said.

"In the short term we are also making sure we are injecting much needed infrastructure funds into the WA economy and creating jobs for hard working West Australians is a top priority as we make our way out of the COVID pandemic."

Australian Associated Press