Railroad Archives Online
- CollectionE0483 - 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
- 113 more...
- Item167-142 - Great Northern Railway Standard Signal Plans; Interlocking Relay Test, 1953
- Item167-143 - Great Northern Railway Standard Signal Plans; Motor Car Shunt, 1953
- Item167-144 - Great Northern Railway Standard Signal Plans; Fouling Turnout, 1946
- Item167-145 - Great Northern Railway Standard Signal Plans; Washer Plate, 1944
- Item167-146 - Great Northern Railway Standard Signal Plans; Signal Locations , 1957
- Item167-147 - Great Northern Railway Standard Signal Plans; Background Adams and Westlake Lamp, 1958
- Item167-147A - Great Northern Railway Standard Signal Plans; Background Indicator Lamp, 1949
- Item167-148 - Great Northern Railway Standard Signal Plans; Guard Rail, Crossing Signal, 1955
- Item167-150 - Great Northern Railway Standard Signal Plans; Bungalow Foundation Spacing, Lock Case Foundation Spacing, General Railway Signal Compan (GRS) Co., 1960
- 6 more...