Union Pacific Photograph Car
I'm researching the photographers Baker and Johnston of Evanston, circa 1881. A 1924 Uninta County History by Elizabeth Arnold Stone says "With a photographer named Johnson he [Charles Baker] established the Union Pacific Photograph Car, well-known for years throughout the West." This Johnson could be Eli Johnson of Evanston or W.J. Johnston of Green River. They’re pretty illusive fellows. Any ideas how I might learn more about the photographers or the UP Photograph Car?