Would you put it in the collector's category, souvenir category, or both? I suppose it could also be a self-esteem booster for those who have a sense of "specialness" owning something few others have.
I don't see it as a Toy Train collector's item.
In my experience, collectors don't go for items that are made in artificially low numbers.
Which is not to say that there aren't people who would enjoy owning one of these boxcars. I bet they will sell out quickly. Enjoy!