Railroad Archives Online
- CollectionE0482 - Great Northern Railway Historical Society Standard Signal Plans Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3005 - Signals
- 73 more...
- Item167-80E - Great Northern Railway Standard Signal Plans; Foundation Concrete Dwarf Signal Type S. A., 1957
- Item167-80F - Great Northern Railway Standard Signal Plans; Foundation Concrete Dwarf Signal, 1953
- Item167-80G - Great Northern Railway Standard Signal Plans; Foundation Concrete Pier for Large Case, 1952
- Item167-80H - Great Northern Railway Standard Signal Plans; Foundation Concrete Instrument House, General Railway Signal Compan (GRS), 1957
- Item167-82 - Great Northern Railway Standard Signal Plans; Carrier, Pipe Strap, 1918
- Item167-83 - Great Northern Railway Standard Signal Plans; Derail Layout, Hayes Pipe Connection To ML Switch, 1920
- Item167-85B - Great Northern Railway Standard Signal Plans; Battery Box Concrete 6, 9, 12 Cell, 1924
- Item167-88 - Great Northern Railway Standard Signal Plans; Cable Tap Connection, Dead Ends, Pole Line Connections, 1922
- Item167-89D - Great Northern Railway Standard Signal Plans; 80 Cell Capacity Battery Well, 1924
- 46 more...