The Public Transport Authority (PTA) proposes to construct and operate 8 km of new railway (including dual tracks and associated rail infrastructure), between Armadale and Byford. The proposal includes modification to the existing Armadale Station and construction and operation of a new station at Byford. The proposal includes the replacement of level crossings with grade separated crossings, either road over rail or rail over road. 

The proposal involves clearing of up to 50 hectares (ha) of vegetation and fauna habitat within a 160 ha development envelope.