Tom,
I guess I should've looked into it a little more, I have a book about it around here somewhere, just really don't want to tear the house apart looking for it! However, now I'm curious and it's going to bug me for a long time if I don't investigate a little bit! I "assumed" that the engines were sold in 1953 as that was when the whole mining and smelting operations shut down. I didn't know thats when the WP was making its last steam runs. Could you post these photos you've seen? I'm sure they were switchers in yards, do you know which ones?
Jon