Regulators step up inspections of crude oil shipped by rail from Bakken field - Article Photos 1/1

A warning placard on a tank car carrying crude oil is seen on a train idled on the tracks near a crude loading terminal Nov. 6 in Trenton, N.D. The transport of oil by rail has expanded more than thirty-fold since 2009, delivering higher prices for oil companies able to access coastal refineries but also raising concerns about spills. AP Photo Matthew Brown