Railroad Archives Online
- CollectionE0480 - Great Northern Railway Historical Society Miscellaneous Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3007 - Track
- ItemTieRenewals1891to1897 - Great Northern Statement of Ties Required for Renewal 1891 to 1897
- ItemTieSpacing_StPMandM_DEST2667 - Saint Paul, Minneapolis and Manitoba Railroad Standard Plan for Spacing Ties, 1888
- ItemTriangleTieSwitchBOM_DEST2666 - Bill of Materials for Various Track Switches Using Great Northern's Experimental Triangular Ties, 1911
- ItemTriangularTieSpacing1898 - Drawing Showing Standard Spacing for Great Northern's Experimental Triangular Ties, 1898