A Diploma of Honorable Mention issued August 14, 1894 by the Board of Lady Managers of the World's Columbian Exposition to George W. Topping for "his skill as an expert artisan [when] he assisted in the production and perfection of the exhibit of the American Balance Slide Valve Co., San Franciso which was awarded a Medal and Diploma at the World's Columbian Exposition" (Chicago, 1893). The Museum also displays Mr. Topping's 1885 model of Central Pacific No. 155 in the lobby of the Railroad History Museum.

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