Suburban Rail Loop cash gap may threaten credit rating

Victoria is staring at a $20b funding gap to build the eastern section of the Suburban Rail Loop. (Joel Carrett/AAP PHOTOS)

A scarcity of federal funding for the contentious Suburban Rail Loop could imperil Victoria's credit rating as a global agency casts doubt on its $34.5 billion price tag.

The Victorian government is staring at a $20 billion funding gap to build the eastern section of the line from Cheltenham to Box Hill.