The Torrens Rail Junction is where the interstate freight railway meets the Outer Harbor passenger railway, located in the Park Lands between Port Road, Thebarton and War Memorial Drive, North Adelaide. The rail junction posed a productivity constraint to the strategically important Adelaide to Melbourne rail freight line, with freight trains forced to give way to Outer Harbor passenger trains at the junction.

This project has grade separated the rail lines by lowering the Outer Harbor rail line below both the interstate rail line and the adjacent Inner Ring Route (Park Terrace).