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
- 25 more...
- 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
- Item167-31J - Great Northern Railway Standard Signal Plans; Installation of Weber Number 1 Insulated Rail Joints Continuous Number 1 for 131 Pound Rail, 1944
- Item167-31K - Great Northern Railway Standard Signal Plans; Installation of Weber Number 1 Insulated Rail Joints Continuous Number 1 for 115 Pound Rail, 1949
- Item167-31L - Great Northern Railway Standard Signal Plans; Installation of Weber Number 1 Insulated Rail Joints Continuous Number 1 for 132 Pound Rail, 1957
- Item167-31M - Great Northern Railway Standard Signal Plans; Installation of Weber Number 1 Insulated Rail Joints Continuous Number 1 for 70 Pound American Society of Civil Engineers (A.S.C.E.) Rail, 1961
- Item167-32A - Great Northern Railway Standard Signal Plans; Installation of Weber Number 3 Insulated Rail Joints, 1914
- 94 more...