What should be the reporting marks on Cincinnati Northern Model Railroad Club rolling stock? CN is not available because it already belongs to Canadian National. Most of the kits that were produced for our club in past years bear the reporting mark CIN. CNOR was suggested as an alternative, but recent research by some of our members has revealed that the prototype Cincinnati Northern RR used NOR from 1923 until at least 1954. (CNOR didn’t appear until the 1970s.). Since we are modeling the early 1950s, it looks like NOR will become the official reporting mark for the CNMRRC.