Ms Watson had been critical of NSW government delays on the project.

"My view was always that the NSW Liberal government had no real desire to upgrade the commuter car park, which is why the start date for work was continually changed," Ms Watson said.

"But I wanted to ensure maximum pressure was placed on the minister to follow through with completing the project.

"That public pressure worked and the commuters who use the Oak Flats station now have more car parking spaces available to them."