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Great Northern Railway Historical Society Blueprint Collection JSBP10030, 1928. Great Northern Blueprint Number XA-23-Sheet 12, Trolley Mast Arm Insulator Attachment. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10031, 1928. Great Northern Blueprint Number XA-23-Sheet 14, Link and Pin for Tunnel Supports and Pole Plate. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10032, 1928. Great Northern Blueprint Number XA-23-Sheet 13, Trolley Mast Arm Heel Plate. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10033, 1928. Great Northern Blueprint Number XA-23-Sheet 10, Assembly of Trolley Mast Arm. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10034, 1928. Great Northern Blueprint Number XA-23-Sheet 11, Assembly of Trolley Mast Arms. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10035, 1928. Great Northern Blueprint Number XA-22-Sheet 16, Slug Plate. Transmission Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10036, 1928. Great Northern Blueprint Number XA-22, Power and Signal Transmission Crossarms. Transmission Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10037, 1928. Great Northern Blueprint Number XA-23-33, Messenger Clamp, Light Type. Cascade Electrification. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10038, 1928. Great Northern Blueprint Number XA-23-Sheet 15, Suspension Eye. Trolley Line Standards. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.

Great Northern Railway Historical Society Blueprint Collection JSBP10106, Washington, 1934. Great Northern Blueprint Number X10-219-14, 44 Kilovolt Transmission Line Poles. Cascade Tunnel to Berne. Interstate Commerce Commission Account Number 31, Power Transmission Systems. Other ICC account descriptions: ICC Account Number 29, Transmission System.