The proposal is to construct and operate the South West Metropolitan Railway from Perth to Mandurah. The proposal includes the establishment of rail infrastructure between Perth and Mandurah with the northern section of the line running from the Perth Central Business District to Anketell tunnel via the Kwinana Freeway. South of the Anketell tunnel, the proposed railway passes through the local government areas of the Town of Kwinana, the City of Rockingham and the City of Mandurah, and terminates in Mandurah at Allnutt Street. The total length of the railway is approximately 72 kilometres.

Implementation of the proposed railway is expected to result in some significant benefits to the community including social benefits, reduced traffic on roads, reduced travel times, and protection of local air quality.