"Ozawa asks of the street-level rail proposal, “Can we guarantee it will cost $2.5 billion?”  Murthy said such a figure is unlikely.  And Murthy expressed confidence that HART could finish the project for the current $10 billion amount."  You notice that neither option can or will guarantee that it can be done under cost; which to many will be a "deal breaker" after being promised the moon to get this rail boondoggle started rolling and then giving the shaft to the tax payers as costs continue to rise and nothing is getting done!