CP said it immediately dispatched teams to the site. The Transportation Safety Board of Canada is also investigating. A total of 39 cars derailed, according to a TSB email to CBC News. Fourteen were residue tank cars—cars containing a residue of previous contents but were empty at the time of the derailment—with eight last containing liquid sulphur, three last containing propane and three last containing anhydrous ammonia, the TSB said. According to an Alberta Emergency Alert for Vulcan County, Canadian Pacific was to be flaring the affected cars throughout the day.