Construction of the $1 billion Morley to Ellenbrook will begin next year with an upgrade of Bayswater Station.

The $146 million project also signals the end of the notorious Bayswater overpass, a cause of sheepish embarrassment for dozens of Perth truck drivers in recent years.

The Bayswater station upgrade is the first stage of Metronet's new Morley-Ellenbrook Line . Credit:WA Government

Three main train lines will connect to the Bayswater station - the existing Midland service and new lines to Ellenbrook and Perth Airport.

Premier Mark McGowan said a bigger station, better road network and more public space was based on public feedback on the station design.