Long-running battle over the Keystone XL pipeline.
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A fiery train derailment that scattered freight-rail tank cars carrying crude oil and forced the evacuation of hundreds of families in West Virginia has revived the ongoing debate of pipelines vs. railroads.

Officials are trying to figure out why the 109-car train went off the track along the Kanawha River Monday and ignited at least 14 tankers, prompting the state’s governor to declare a state of emergency.