Almost two years after the government announced a study into four proposed fast rail routes - including a "southern coast route" to Nowra - it still has not been released.

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High speed rail expert Professor Andrew McNaughton was commissioned to decide which of the routes were feasible and should be pursued.

That report has been in the hands of the NSW government for more than six months - Regional Transport Minister Paul Toole told a budget estimates committee in early March that he had received it.

Yet the government has so far declined to release the report, despite Mr Toole telling the committee "this is a government that actually releases reports for the community to see".

Indeed Transport for NSW would not comment on when or if the report would be released or what Prof McNaughton's conclusions were when it came to faster rail for the Illawarra.

"The NSW government's commitment to develop a blueprint for the delivery of a fast rail network is a major piece of state-shaping work," a Transport for NSW spokesman said.

"This transformative vision will seek to link regional centres to each other and Sydney.

"The NSW government is taking the time to get this vision right and will continue updating the community as plans develop."

The spokesman pointed to work being done on the South Coast line, including the planning work for the construction of a crossing loop near Toolijooa, which will duplicate some of the rail line between Berry and Gerringong so trains can pass each other.

Another platform at Bomaderry station is also planned so that a train can arrive before another departs.

However it is not known whether this work was a recommendation in the high speed rail report.

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