A government warning about the dangers of increased use of trains to transport crude oil is giving a boost to supporters of the long-delayed Keystone XL pipeline. U.S. and Canadian accident investigators urged their governments Thursday to impose new safety rules on so-called oil trains, warning that a “major loss of life” could result from an accident involving the increasing use of trains to transport large amounts of crude oil. The announcement came in the wake of a string of high-profile accidents. In July last year, a crude oil train crash in Quebec caused an explosion and fire that killed 47 people . Another train carrying crude oil derailed and exploded in North Dakota last month . No one was killed, but the incident prompted evacuation orders for residents of a nearby town. Pipeline supporters said the stern joint warning by the U.S. National Transportation Safety Board and the Transportation […]