Great Northern Railway Historical Society Blueprint Collection JSBP0523, Blackfoot, Montana, 1951. Great Northern Blueprint Number 9419-1, Standard 16' X61'4'' Steel Signal Maintainer's and Motor House. Floor Plan, Elevations, Sections and Details. Authorization for Expenditure 81328. Interstate Commerce Commission Account Number 16, Station and Office Buildings. Other ICC account descriptions: ICC Account Number 16, Yard Building.

Great Northern Railway Historical Society Blueprint Collection JSBP0524, Blackfoot, Montana, 1951. Great Northern Blueprint Number 9419-1, Standard 16' X 61'4'' Steel Signal Main. and Motor House. Floor Plan, Elevations, Sections and Details. Authorization for Expenditure 81328. Interstate Commerce Commission Account Number 17, Roadway Buildings. Other ICC account descriptions: ICC Account Number 17, Motor Car House.