Railroad Archives Online
- 宗卷E0477 - BNSF Maps, Drawings and Records Collection
- 系列003 - Great Northern Railway Company (U.S.)
- 次系列009 - Engineering Records
- 005 - Signals
- 物件EBP0437 - Signals Technical Drawing, 1901
- 物件EBP1860 - Great Northern Track Technical Drawing, 1907
- 物件EBP2618 - Northern Pacific Signal Technical Drawing, 1902
- 物件EBP3610 - Northern Pacific Signal Technical Drawing, 1898
- 物件EBP4365 - Great Northern Signal Technical Drawing, 1912
- 物件EBP4367 - Great Northern Signal Technical Drawing, 1918
- 物件EBP4368 - Great Northern Signal Technical Drawing, 1918
- 物件EBP4369 - Great Northern Signal Technical Drawing, 1918