Great Northern Railway Historical Society Blueprint Collection JSBP10476, Minnesota, 1952. Great Northern Blueprint Number EC.2068, Signal Maintainer's and Section Tool House. Floor Plan. Authorization for Expenditure 72903. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP1050, Crookston, Minnesota, 1925. Great Northern Blueprint Number 102.09.05, Interlocking. (Redland) - Automatic. Authorization for Expenditure 30087. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP10513, 1956. Great Northern Blueprint Number 167-80B, Foundations for Signals. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP10526, 1960. Great Northern Blueprint Number 167-152, Standard Plan - Locating Appartus. At Siding Switches, Centralized Traffic Control Territory. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP10659, undated. Train Order Board. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP1113, Dakota Division, 1902. Signal Located Between Track Or On Building. Sections. Authorization for Expenditure 7003. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Train Order Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP1236, Devils Lake, North Dakota, 1949. Signal Maintainer House. Elevation, Situation Plat. Authorization for Expenditure 71777. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP1700, Glyndon, Minnesota, 1909. Great Northern Blueprint Number B.10.52, Interlocking. Automatic. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP2020, Great Falls, Montana, 1938. Great Northern Blueprint Number 113-10-1, Highway Crossing Signals. Maps. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.

Great Northern Railway Historical Society Blueprint Collection JSBP2512, Hillsboro, North Dakota, 1949. Signal Maintaner House. Authorization for Expenditure 71777. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Signal.