U.S. rail delivery of petroleum and petroleum products was up 0.8 percent last week from the same period in 2013, the American Association of Railroads said. The AAR said Thursday 13,255 carloads of petroleum and petroleum products, or about 9.3 million barrels of oil, were delivered on the rail system for the week ending Feb. 1. While slightly up from a year earlier, it was a 12.8 percent decline from the previous week. John Gray, senior vice president for the AAR, said Thursday grain and petroleum products were the only commodity groups reporting increased shipments for last week. Gray said it was likely that severe winter conditions affected shipments. “We can’t quantify it precisely but the extreme cold probably held down rail traffic to some extent,” he said. Since Jan. 1, the AAR said, 72,022 carloads, or about 50 million barrels of oil, were […]