Site preparation for the project – part of a $105 million package featuring the station, new trains, a bus interchange, 2000 parking bays and the widening of Russell Road bridge to eight lanes – began at the end of last year.
PTA spokesman David Hynes said the project had tracked well since then.
“A number of site works for the integrated transport project have been completed, including clearing and fencing the site of the future station and its 2000-bay car parks,” he said.
“Earthworks are still under way at these sites, and will continue for some time.
“While the most noticeable new addition to the site is a scaffolding access tower to the Russell Road bridge, there is a particularly exciting stage in the construction process occurring closer to the ground.”
Mr Hynes said construction of the station’s platform walls were also well under way, although it was less obvious to passers-by because of freeway barriers.
“Once the walls are completed, work on the station platforms and above-ground structural steel will begin, ahead of major concourse works in June,” he said.
While no exact finish date has been locked in, completion of the project has been set for early 2017.
The PTA would not budge on that last week, with Mr Hynes saying the station and road upgrades would be “delivered together in 2017”.
In November Cockburn MLA Fran Logan said a clear finish date was needed.
“The Premier and Transport Minister must tell residents exactly when construction will start and exactly when residents will be able to use the station,” he said.