I'll move to DOT-111 cars. Obviously both CN and CP don't own a significant number of DOT-111s, but my understanding is there are about 80,000 DOT-111s in circulation, and the cost of getting those either retrofitted, which is maybe not possible, or manufactured is significant. Are you aware that there are that many cars out there? Are you aware of the length of time that it would be reasonable to expect that they would, over a course of time, be replaced? I understand from one of the manufacturers that was here that it's not a simple process to simply put those kinds of numbers on track.
Would anyone care to comment on that?