Great Northern Railway Historical Society Blueprint Collection JSBP1281, Duluth, Minnesota, 1915. Great Northern Blueprint Number 110-6-1, Duluth Terminal Trestle. Interlocking and Signaling for Soo Connection With Duluth Terminal Trestle. Authorization for Expenditure 25058. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking and Signaling.

Great Northern Railway Historical Society Blueprint Collection JSBP1300, Duluth, Minnesota, 1926. Great Northern Blueprint Number 110-601, Duluth Terminal Trestle. Changes In Interlocking and Signaling for Soo With Duluth Terminal Trestle. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Railway Historical Society Blueprint Collection JSBP1377, Elbow Lake, Minnesota, undated. Great Northern Blueprint Number A.10.61, Crossing Signaling. Wiring Diagram. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Railway Historical Society Blueprint Collection JSBP1379, Elk River, Minnesota, 1908. Great Northern Blueprint Number A10.76, Elk River Interlocking. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Railway Historical Society Blueprint Collection JSBP1380, Elk River, Minnesota, 1908. Great Northern Blueprint Number A10.76, Elk River Interlocking. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Railway Historical Society Blueprint Collection JSBP1387, Elk River, Minnesota, undated. Crossing Alarm Bell. Situation Plan. Interstate Commerce Commission Account Number 15, Crossings and Signs. Other ICC account descriptions: ICC Account Number 14, Public Crossing.

Great Northern Railway Historical Society Blueprint Collection JSBP1412, Essex, Montana, 1916. Snowshed # 12. Extension. Authorization for Expenditure 2215. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Railway Historical Society Blueprint Collection JSBP1419, Essex, Montana, 1919. Snowshed # 12. Drainage Sketch. Authorization for Expenditure 11206. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Railway Historical Society Blueprint Collection JSBP1420, Essex, Montana, 1919. Snowshed # 12. Profile of Line. Authorization for Expenditure 11206. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Railway Historical Society Blueprint Collection JSBP1485, Fargo, North Dakota, 1906. Northern Pacific Railroad Blueprint Number 86-6, Northern Pacific Railroad and Chicago, Milwaukee, St. Paul and Pacific Railroad crossing. Proposed Arrangement of Interlocking. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 28, Interlocking.