There are actually a number of certificates. I just want to clarify that there's the railway operating certificate, which is issued by Transport Canada, and that's the mechanism that gets more into questions of safety. Then, as a concurrent piece, we do the certificate of fitness, which really looks more at the economic viability, the underlying business case. We certainly coordinate with Transport Canada to ensure that they are issued, I guess, in conjunction with each other.
In terms of how often we do it, we do issue it once. However, we do review the certificate of insurance yearly. We also have provisions to monitor whether we receive a complaint or if, on inspection, we find that there are deficiencies, and we have provisions to suspend or cancel.