Yes there is $3 billion difference between what the liberals have come up,and what McGowan has. We know(instead of those that make things up),that part of the costing differential,is the duplication of the Midland line between Bayswater and Midland stations, and the extent to which Labor's airport line must be sunk as it swings south around Perth Airport's runways. Time will tell.
Meanwhile cols overspent,debt will be around $25 billion,credit rating down the crapper,well done col.
By the way,should anyone who listed to McGowan on 6pR,he said if the liberals release their costings,we'll offer ours for costings. Metronet is getting traction,much to cols chagrin.