Railway photographer Mark Perry photographed two of the CN slugs purchased by NB Southern in Winnipeg and gave me permission to post them here. Thanks, Mark!
By the way, Mark has some great photos up on Flickr and a book. Check them out!
Note the raised headlights on ex-CN 269, absent on 501. As I said before, the 2xx series slugs seem to be used for road service and industrial switching, not for humpyard work, so they need visible headlights for crossings.
You can read about the slugs that NB Southern purchased.