CP 9303 is the biggest engine CP has at 6000hp. CN's got nothing that's even close. The four engines are anything but problematic however - this winter during a traffic down-turn CP chose to store them in favor of running old soon-to-be-retired SD40-2's! That's how much they don't like them, and after seing it smoke more then it should, I agree. There's something wrong with the big MAC's, although the smaller 4300hp version seems to be doing just fine. These units are normally assigned in and around Winnipeg, so it was a special treat yo see it make it this far wet. Even in Winnipeg they weren't exactly easy to spot. Normaly this train has 3SD40-2's for power, but with the SD90MAC-H, they only needed one more unit.