We've definitely seen in a number of our investigations over the years that there are sometimes weaknesses in the risk assessments that are done by railway companies. Either they may not identify the hazard, or they may identify it and not take appropriate mitigation. This predates, certainly, Lac-Mégantic; there are other reports where we've identified this.
I think the evolution to a mature safety management system and a mature risk management process, while it may not be perfect, does take time, and it does take learning—unfortunately, from some bad experiences—but hopefully the system will become mature over time and will be more effective than it has been to date in some cases.