Both stations are included in the latest round of the Transport Access Program, which looks to upgrade stations so they comply with the federal Disability Standards for Accessible Public Transport regulations.

The Transport for NSW website lists both stations as being in the "design and planning" stage.

But Fairy Meadow is moving ahead, with Transport for NSW last month releasing the Review of Environmental Factors (REF) for public feedback.

The release of the REF is a necessary step towards the construction of lifts at Fairy Meadow, with the window for public feedback closing on May 14.

It's a step that has not yet been made when it comes to Unanderra station, with Transport for NSW previously stating it needed to carry out further "technical investigations and planning works" before it can progress.

The proposed improvements to Fairy Meadow include two lifts from the Elliotts Road overpass, a new ramp and set of stairs to platform two, a family accessible toilet and an ambulant toilet, a new kiss and ride bay and upgrades to lighting and CCTV.

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The upgrade will also remove the level crossing now at the northern end of the station.

There is a long list of issues with access to Fairy Meadow, according to the REF.

These include problems with the station entrance from the commuter car park, access to both platforms, inaccessible toilet facilities and a disabled parking not being compliant with legislation.

A start to the project could be as few as six months away, according to the REF.

"Subject to planning approval, construction is expected to commence in late 2019 and take around 12 months to complete," the REF stated.

Once that construction begins, Transport for NSW does not see it having a significant effect on road traffic near the station, nor will there be an impact on train travel.

"Heavy vehicles would generate approximately one to five movements per day from Monday to Friday, and up to around 16 movements during weekend rail possession," the REF stated.

"It is expected that this would result in a minimal impact on existing traffic conditions.

"There would be minimal impacts on Elliotts Road and no road closures are proposed."

Transport for NSW is now considering the submissions made by the public.

It will respond to any question raised in a Determination Report, which will also include whether the upgrade has received planning approval.