Railroad Archives Online
- FondsE0477 - BNSF Maps, Drawings and Records Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Teilserie009 - Engineering Records
- 005 - Signals
- ObjektEBP0437 - Signals Technical Drawing, 1901
- ObjektEBP1860 - Great Northern Track Technical Drawing, 1907
- ObjektEBP2618 - Northern Pacific Signal Technical Drawing, 1902
- ObjektEBP3610 - Northern Pacific Signal Technical Drawing, 1898
- ObjektEBP4365 - Great Northern Signal Technical Drawing, 1912
- ObjektEBP4367 - Great Northern Signal Technical Drawing, 1918
- ObjektEBP4368 - Great Northern Signal Technical Drawing, 1918
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