The ratings on Norfolk, Va.-based Norfolk Southern Corp. reflect its strong competitive position as one of the two large eastern freight railroads and the favorable industry risk characteristics of the U.S. freight railroad industry. Price competition from other railroads and trucking companies and the capital intensity of the industry partially offset these strengths. Norfolk Southern operates the fourth-largest rail system in the U.S. The Norfolk Southern rail operations consist of a 21,000-mile system serving 22 eastern states, and the District of Columbia. Norfolk Southern enjoys healthy competitive positions in the transportation of a number of commodity groups. It has a well-diversified traffic base, consisting of coal (29% of 2009 freight revenue), intermodal (19%), agricultural/consumer products (15%), chemicals (13%), metals/construction materials