What we have said is the sooner the better. The longer those cars are out there, the longer the risk is in the system. It is a very complex situation, and you're quite correct when you say that there has to be coordination with the Americans. This traffic is going back and forth across the border all the time, so you can't say some cars are American and some are Canadian. You can't do that.
What we have said to the regulators is, “This is your job. You work this out, and you come up with a timeframe that will get those cars out of service”, and the sooner the better.