In March, 1995, at least two of the cars were spotted on Kingston's Aluminum Spur (above). The cars may have been in Arvida-Kingston service for awhile. A photo on the Canadian Science and Technology Museum website shows coils being unloaded at Kingston: http://imagescn.technomuses.ca/railways/index_choice.cfm?id=60&photoid=31845547
The cars had CN and Alcan logos on their covers. I've yet to add the CN logos to my HO-scale gondola's covers. When Alcan Rolled Products was spun off to Novelis in 2004, the Alcan logos were painted out. A one-day trace of the gondola fleet in the late 1990's:
Arvida, Roberval & Saguenay: 188400, 188402, 188403, 188405, 188416, 188424, 188427, 188429, 188433, 188434.
Garneau Yard: 188401, 188431.
Montreal Taschereau Yard on train 364: 188407, 188411, 188414, 188415, 188417, 188418, 188420, 188425, 188432.
Oshawa on train 369: 188404, 188406, 188413, 188419, 188426, 188428.
Flint, Michigan on train 216: 188410.
Chicago, Indiana Harbor Belt: 188409, 188412, 188421, 188422, 188423.
In the 1960's, CN and CP were competing for Alcan's business in Kingston. Alcan was one of CP's major customers here, and much of the rolled aluminum was sent to Wilkinson in British Columbia. CN sent the rolls in tarped gondolas, but the tarps had to be rolled up and shipped back - a troublesome process. CP developed two-section steel lids which provided better protection from the elements. This probably explains the presence of that covered CP gon in an earlier post on Kingston's CN-CP interchange.
Thanks to Ian Stronach for sharing information on Alcan. An HO modeller, Ian's Montreal Terminals is a professional-looking operation.