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Mr. Sol and I were posting at the same time, and I just read his reply. <br /> <br />What I meant by "primary sources" was anything in a railroads archives, any kind of written matter such as reports and studies, etc, created by the company's own internal experts. I meant to use this term to contrast with published work from people outside the company, such as in trade journals, Media, newspapers, etc. Mr. Brown was an outside consultant, so his write-up in the Mechanical Engineeering journal you cite is an out-siders take on the matter. I never intended any criticism of him whatsoever.
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