Bing Siding, The David and Goliath of BHP Billiton's' motive power roster in the guise of GE AC6000 unit 6073 'Fortescue' serial 51065 and EMD SD40R unit 3089 serial 31512 originally Southern Pacific SD40 SP 8431 stand on the passing track waiting a run south to the mines 23rd August 2007.