Marten Transport’s Truckload segment, which provided a little less than 48% of its earnings in the third quarter, had a negative operating ratio (OR) during the period for the third time in the last five quarters, though the company overall remained profitable. In an earnings release delayed about a week after its normal date–Marten (NASDAQ: MRTN) usually comes out with its earnings right after the leader of the trucking pack, J.B. Hunt–the company also reported that the OR net of fuel in its Truckload gr ...