Great Northern Railway Historical Society Blueprint Collection JSBP4789, Sioux City, Iowa, 1916. Great Northern Blueprint Number 3112.03.01, Crossing Frog. Replace 60 # Frog with 80 # Frog. Authorization for Expenditure 4875. Interstate Commerce Commission Account Number 12, Track Laying and Surfacing. Other ICC account descriptions: ICC Account Number 12, Rail Line.

Great Northern Railway Historical Society Blueprint Collection JSBP4790, Sioux City, Iowa, 1916. Great Northern Blueprint Number 1085.27, Crossing Frog. Diagram of Crossing of Cnw Railway and Union Terminal Railway Co. Authorization for Expenditure 4875. Interstate Commerce Commission Account Number 12, Track Laying and Surfacing. Other ICC account descriptions: ICC Account Number 12, Rail Line.

Great Northern Technical Drawing 1219-31-7, Crossing Frogs Illinois Central & Union Terminal (Void), 1906. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-6, Crossing Frogs Illinois Central & Union Terminal (Void), 1906. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-1, Crossing Frogs Illinois Central & Union Terminal (Superceded), 1906. Other subject categories: Drawing

Great Northern Blueprint Number 1240-34-1, Great Northern Crossing Frogs Illinois Central & Union Terminal, 1906. Other subject categories: Drawing

Great Northern Blueprint Number 1240-34-2, Great Northern Crossing Frogs Illinois Central & Union Terminal, 1906. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-2, Crossing Frogs Illinois Central & Union Terminal (Removed 1919), 1919. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-4, Crossing Frogs Illinois Central & Union Terminal (Removed 1919), 1919. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-8, Crossing Frogs Illinois Central & Union Terminal, undated. Other subject categories: Drawing