"Keep out" signs warning of hidden hazards, and bush and sand dunes as far as the eye can see. A lone flag is one of few signs of human habitation.

At first glance this may not look like a thriving metropolis, much less a place in need of a train line anytime soon.

The Government hopes the area will become a northern suburbs hub. ( ABC News: Jacob Kagi )

But the WA Government says this bushland is set to become "Perth's newest city centre", as it prepares to begin construction of the extension of the northern suburbs train line.

By 2021, Alkimos Central will have its own train station — one of three new stops to be built as the line is extended to Yanchep — and form part of what the Government hopes will become a northern suburbs hub.

An artist's impression of what the future Alkimos will look like. ( Supplied: WA Government )

"(This is) the implementation of the plan we took to the election, to build and plan train lines in conjunction with new communities to make sure we get more modern, vibrant communities for people to live," Transport Minister Rita Saffioti said.

The precinct will form part of what the Government has dubbed a "transport-focused community", with the train station at the heart of residential, retail and commercial developments.

There are some, but not many, signs of what the future holds. ( ABC News: Jacob Kagi )

"The station has been put in place to allow development right next to the station, having residents in very close proximity," Ms Saffioti said.

While the 200-hectare Alkimos Central site — which is just over 40 kilometres from the CBD — is yet to be built up, the area around it has quickly developed over recent years, and Ms Saffioti said those new residents would need better transport links.

WA Labor's Metronet plan. ( Supplied: WA Labor )

The 2016 census revealed Alkimos had a population of 6,269 at that time.

But as Perth continues to sprawl, the Alkimos and Eglinton area has become the fastest growing part of WA.

Its population surged by 25 per cent in 2016–17 and, once the area is fully developed, planners expect 60,000 people will live there.

"There is a new street being developed every week," local MP John Quigley said.

"For people to commute to job centres, the rail is absolutely essential."

The train journey to Perth from Alkimos will take 41 minutes, with stations also to be built further away at Eglinton and Yanchep.

The Government's Metronet plans also include a rail link between Cockburn and Thornlie, a train line to Ellenbrook and extensions of the Midland and Armadale lines.