Federal treasurer Scott Morrison has defended Infrastructure Australia's critical assessment of the Palaszczuk government's Cross River Rail project and refused to make a funding commitment.

In its evaluation of the $5.4 billion project, IA found its benefits were overstated and called for another business case to be drawn up, addressing a number of concerns. “IA hasn’t given a pass mark, so certainly if that’s the case, I can’t see that on the agenda,” Mr Morrison…