I know that CP painted their auctoracks black with CP Rail lettering and used the multimark logo in the eighties up until they dropped the multimark... which I think was in 1988. But I guess I need to know when they started painting them red without the multi. One would think this changed in 1988, but they may have not. I wish IM would post built or new dates like Atlas has started doing.
BTW, I think you mean Expo 86 unit's, not Olympic.