The prospect of further contingency costs to complete the 12.8-kilometre line also remain for the government,and are likely to push the final bill to taxpayers beyond $3 billion.
Asked whether the final cost will surpass $3 billion,Transport Minister Andrew Constance conceded that there would be further expenses to complete the line.
But he said he did not want to"speculate"on the final bill because as"part of the additional costs there is a significant contingency which mightn't need to be used". The final cost would not be known until passenger services began,he said.
"Everybody has skin in the game and everybody has lost skin as a result of this project,"he said.
The $576 million settlement includes up to $129 million that will be paid only if ALTRAC meets construction milestones,including the start of passenger services between Circular Quay and Randwick by December,and between Circular Quay and Kingsford by March next year.