Very recently there was a "O" Scale SP GS-1 4-8-4 for sale on the Bay. Supposedly one of four. What interested me about this was that the engine was painted green! Number was 4408 and the tender was lettered "Southern Pacific Lines".
I have a good friend who models SP and we looked at several of his sources, including his excellent Church book and could find NO reference in his comprehensive book collection that SP ever painted one of their 4-8-4's green. We did glean from the Church book that the real engine was built by Baldwin in 1930 and the word "Lines" was removed from SP tenders in 1945 or so. The engine was evidently identical to a few others built for the SP subsidiary T&NO with road numbers in the 700's, and was reassigned there for a time and renumbered. We did not find any reference to green used by the T&NO either.
Was this engine ever painted green? If it was, "why"? I would need a "chapter and verse" reference to assure my buddy that the green on the model was not "artistic license" on the part of the model manufacturer!