Oil and refined products account for about 5% of the total Rail carloads in the US
http://www.freerepublic.com/focus/news/3198100/posts
8/28/2014
Eight of 10 of the carload commodity groups posted increases compared with the same week in 2013, including petroleum and petroleum products with 16,396 carloads, up 28.4 percent; grain with 18,721 carloads, up 17.6 percent; and nonmetallic minerals with 40,279 carloads, up 10.5 percent. The commodities that posted a decrease were coal with 115,050 carloads, down 3.9 percent; and chemicals with 30,003 carloads, down 0.1 percent.
I know what you are saying but the pressure seems to be on the rails where there is transport of grain and crude over the same tracks.
Meanwhile, on the tracks near my house, the coal trains run all night full and return empty during the day.
What percentage is it for North Dakota? National numbers aren’t all that relevant for a regional or local market.