I remember seeing the advertisements for these in the S Gaugian. They came out several years before the AM GG1, although I think the AM is a much more detailed model. But in product-starved S, you took what you could get!
There was a mention in the S Gaugian once of a company that was going to produce a Southern Pacific Daylight GS4 based on the AF Northern chassis. As I recall, it was going to be very expensive (maybe $600-800, which at the time was even more than it would be today). I think you could provide the running gear for a reduced price. I think I only saw this once in the S Gaugian and I have never heard of or seen one of these models since, so I assume they were never made. Does anyone else remember that one?
Scott Griggs, Louisville, KY