Great Northern Blueprint Number X15-301 Sheet1 , Great Northern Converter Substation - One Line Diagram, 1927. Other subject categories: Drawing

Great Northern Blueprint Number X15-301 Sheet 5, Great Northern Converter Substation - Switchboard Wiring Board at Puget Sound Power and Light Company Station, 1927. Other subject categories: Drawing

Great Northern Blueprint Number X15-301 Sheet 6, Great Northern Converter Substation - Arrangement of Apparatus on Switchboard Panels, 1927. Other subject categories: Drawing

Great Northern Blueprint Number X15-301 Sheet3, Great Northern Converter Substation - Typical Indoor Oil Circuit Breaker Arrangement, 1927. Other subject categories: Drawing

Great Northern Blueprint Number X17-303-7, Great Northern Cascade Electrification - Trolley Structure Footing Details Electrification Section Number 43, 1928. Other subject categories: Drawing

Great Northern Blueprint Number X17-303-6, Great Northern Cascade Electrification - Trolley Structure 'H' Column Details, Electrification Section Number 43, 1928. Other subject categories: Drawing

Great Northern Blueprint Number X17-303-5, Great Northern Cascade Electrification - Trolley Structure 'H' Column Details, Electrification Section Number 43, 1928. Other subject categories: Drawing

Great Northern Blueprint Number X15-308-5, Great Northern Track Substation - Steel Details Section B-B, 1929. Other subject categories: Drawing

Great Northern Blueprint Number X15-308-6, Great Northern Track Substation - Steel Details Section C-C, 1929. Other subject categories: Drawing

Great Northern Blueprint Number X15-308-4, Great Northern Track Substation - Steel Details Elevation A-A, 1929. Other subject categories: Drawing