When I started this post, CN doing heritage units was hypothetical, but so far there is an unofficial portrait of at least 5.

https://railpictures.net/photo/754510
Noticeably missing from this lineup is the DM&IR and B&LE. Others as well, (I recently read about a Slave Lake line that apparently had a Yellow/Orange scheme that I would like to see on a big diesel. but these are the two I would expect them to do that they haven't. They are being incredibly mysterious about it: any idea why? Pictures of the heritage units they have so far are surprisingly rare...