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
- 13 more...
- Item167-21 - Great Northern Railway Standard Signal Plans; Smashboard, 1915
- Item167-24C - Great Northern Railway Standard Signal Plans; Bootleg, Connections for Signal and Battery Locations, 1956
- Item167-25A - Great Northern Railway Standard Signal Plans; Bootleg Shunt, 1923
- Item167-25B - Great Northern Railway Standard Signal Plans; Connections - Switch Box, Assembly, 1924
- Item167-27A - Great Northern Railway Standard Signal Plans; Elevator, Battery, 3 Cell, 1916
- Item167-27B - Great Northern Railway Standard Signal Plans; Elevator, Battery, 3 Cell - Special, 1918
- Item167-30A - Great Northern Railway Standard Signal Plans; Insulated Gauge Plates for Model Number 5 Switch Machine, 1925
- 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
- 106 more...