That is/was the wholy owned railroad of Springs Mills, a large USA and Carolina textile company. As I recall Springs public relations management had some custom HO equipment made during the 1960s or 1970s for give-aways to customers and community leaders.
Col. Elliot Springs, a WWI aviator and the CEO during the 1930s-40s appointed Gypsy Rose Lee the famous stripper to the railroad's and parent company's Board of Directors. He loved publicity and in addition to Ms. Lee's appointment was famous for his risque ads during the 1930s, such as "A Buck well spent on a SpringMaid Sheet" which pictured an obviously exhausted Indian Brave with his tongue hanging out and a smiling Indian Maid.
I do not recall any o-gauge equipment aside from that already mentioned by prriscool.
Dewey
I don't know of any. I looked at my guide books and only saw the cars you already mentioned. Maybe you saw a custom paint job, or its from another manufacturer.
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