| Unidentified photographer Pennsylvania Railroad Locomotive at Altoona Repair Facility 1868 (ca) Albumen print 27.3 x 43.2 cm (10 3/4 x 17 in) American Art Museum, Smithsonian Institution Museum purchase from the Charles Isaacs Collection made possible in part by the Luisita L. and Franz H. Denghausen Endowment LL/7633
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