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
- 20 more...
- Item167-30B - Great Northern Railway Standard Signal Plans; Gauge Plates, Insulated - Lap Joint, 1931
- Item167-30C - Great Northern Railway Standard Signal Plans; Gauge Plates, Insulated - Butt Joint, 1957
- Item167-31A - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints Continuous Number 1 for 90 Pound Rail, 1917
- Item167-31B - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints Continuous Number 1 for 130 Pound Rail, 1919
- Item167-31C - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints , 1917
- Item167-31D - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints Continuous Number 1 for 100 Pound Rail, 1923
- Item167-31E - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints Continuous Number 1 for 85 Pound Rail, 1923
- Item167-31F - Great Northern Railway Standard Signal Plans; Joints, Insulated Rail, Continuous Number 1 for 75 Pound-77-1/2 Pound-80 Pound Rail, 1924
- Item167-31G - Great Northern Railway Standard Signal Plans; Installation of Insulated Rail Joints Continuous Number 1 for 110 Pound Rail, 1925
- 99 more...