Union Pacific says it has completed its rail fastening system replacement work throughout the eight miles of curved track in the Columbia River Gorge.  The track throughout the curves is now secured with a fastening system that includes spikes instead of lag bolts, enhancing defect detectability during inspections.  That work coming in the wake of last June’s oil train derailment in Mosier.  The company says it has made considerable safety improvements, reducing reportable derailments across the network by 35 percent from 2000 to 2015. In Oregon specifically, Union Pacific reduced reportable derailments by 58 percent from 2000 to 2015.