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All we know is that he ...became involved in various other businesses including railroads, shipping and manufacturing.

I think we need a bit more detail to justify his category of 'American civil war industrialist'. Valetude ( talk) 16:53, 28 November 2015 (UTC) reply

According to Roy L. Martin History of the Wisconsin Central (Bulletin No. 54, The Railroad and Locomotive Historical Society, 1941) Colby, Wisconsin, was named for Gardner Colby's son Charles. Martin's book is semi-authoritative. It has some errors, and has no citations, but generally speaking it conforms and is verifiable by other sources. In this case he is likely correct. See page 28 of that book.