I'll say one thing on that, because it's a really good question.
What I think Mr. DeJong was saying a minute ago was that under the new stronger regulations on key trains and key routes, CN is legally obliged to perform a new risk assessment and submit it to Transport Canada. They are performing that risk assessment now, and it is through that risk assessment, and our review of that risk assessment, that we get to the underlying facts that drive the answer to your question.