Railroad Archives Online
- ФондовиE0483 - Great Northern Railway Historical Society Standard Signal Plans Collection
- Серија003 - Great Northern Railway Company (U.S.)
- Подсерија009 - Engineering Records
- 008 - Physical plant drawing
- 005 - Signals
- ЈединицаCover - Great Northern Railway Standard Signal Plans; Cover, 1905-1962
- ЈединицаIndex - Great Northern Railway Standard Signal Plans; Index, 1905-1962
- Јединица167-09 - Great Northern Railway Standard Signal Plans; Rod, Switch Box, 1913
- Јединица167-09A - Great Northern Railway Standard Signal Plans; Connections - Switch Box Connections, 1922
- Јединица167-10 - Great Northern Railway Standard Signal Plans; Switch Box Application, 1915
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