UPDATE 4-Train collision in North Dakota sets oil rail cars ablaze
December 30, 2013 at 19:43 PM EST
FARGO, N.D., Dec 30 (Reuters) - A BNSF train carrying crude oil in North Dakota collided with another train on Monday, setting off a series of explosions that left at least 10 cars ablaze, the latest in a string of incidents that have raised alarms over growing oil-by-rail traffic.