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Tractor trailer photograph from the George Werkema Collection of Northern Pacific Railroad Company subjects, some taken by Mr. Werkema and some from other sources in locations across the western United States.

The Tractor Trailers section of the Cordell Newby Collection includes color slides of Great Northern Railway trailers.

Still photographs of tractor trailers operated by railroad companies

Technical Drawing 1219-25-18, Number 10, 15 Foot Spring Rail Frog, undated. Other subject categories: Drawing

Great Northern Blueprint Number 1191-32, B&S Patented Cattle Guard (also blueprint), 1906. Other subject categories: Drawing

Great Northern Blueprint Number 1209-30-2, Track Profile, Located Line, Logging Spur, Wilton to Long Lake, 1904. Other subject categories: Profile