The legal action comes as the government prepares to go head-to-head with Spanish construction giant Acciona in the NSW Supreme Court on Friday.
Acciona will seek orders from the court to dismiss a motion by the state's lead transport agency to strike out the Spanish company's $1.2 billion claim for costs and damages against the state.
Opposition Leader Luke Foley said the light rail project was “becoming the most disastrous infrastructure program delivered in NSW history”.
“You now have a queue of companies at the door of the highest courts in the state,lined up in legal battles with the Berejiklian government,” he said.
But Premier Gladys Berejiklian told Parliament on Wednesday during question time that VAC had been in dispute with the government for more than a year.
Responding to Labor's attack,Ms Berejiklian said the opposition benches should"hang your heads in shame about the lack of infrastructure you built when you were in government."