Lac-Mégantic: ceci n'est pas un accident

The night of July 6, 2013, changed the small, picturesque town of Lac-Mégantic in Quebec’s Eastern Townships in unfathomable and horrifying ways. In a matter of minutes, 47 people were killed instantly, and more than 2,000 were displaced when an unattended train derailed nearby. What exactly transpired that night?