Chris Mears sent me some photos of the snowplow that Smurfit Stone used to own in Bathurst. These were taken back in August 2006, when the mill was shut down but before the plow was taken away. Thanks, Chris!
The snowplow is ex-CN 55121, built in 1916 by CC&F as CGR 295542.
Here's a photo I took of it back in July 2002.