Hill: The Department of Transportation and Association of American Railroads (AAR) announced an agreement Friday to lower the speed limit for freight trains carrying crude oil. They also agreed to inspect tracks more frequently as part of a new safety effort. The voluntary reforms follow the high-profile December derailment of a train in Casselton, N.D., that resulted in 400,000 gallons of crude oil being spilled and prompted a push for more stringent federal regulation of freight rail shipments involving...