March 9 (Bloomberg) --- Since July 2013 four trains carrying Bakken crude from North Dakota have exploded, erupting in massive fireballs and, in one case, killing 47 people. There are several reason why these trains are exploding -- there's more oil traveling on rails than ever before and Bakken oil is more combustible than other types of crude. Even though we know what the problems are, the solutions to prevent such accidents are anything but easy. Bloomberg Businessweek's Sam Grobart reports. (Source: Bloomberg)
