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Peter: I am wrong on the GP28, you are right, insofar as the engine. I should haul home a few more books so I can verify things before I start typing. <br /> <br />The problem with the GP39-2 theories we're both advancing is we're arguing intent on the one hand, and on the other hand our evidence is practice. Those are two different things! <br /> <br />SP SD39s were principally used as helpers, as far as I saw. For many years, a set worked out of San Luis Opispo. One rarely saw them out of California, as Peter pointed out.
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