I was able to find some "informal" paint information for an issue of a B&A O gauge Hudson. Evidently, the green color of the boiler and that of the tender differed. I referred the manufacturer to Bob Buck, now deceased, who owned Tucker's Hobbies. Bob saw these engines as a boy and, as a photographer and modeler, was able to view the manufacturer's samples of various greens and made that decision for them. (I originally received this manufacturer request as a Director of the NYCSHS.) This FWIW. I never followed up with Buck to try to determine how many Hudsons and Berkshires were painted this color. My understanding, however, is that it was more common on B&A Hudsons "as delivered". I do not have any information re how many, if any, Berks were painted in these shades of green.