Railroad Archives Online
- フォンドD0027 - Timothy Miller Collection
- シリーズ003 - Great Northern Railway Company (U.S.)
- サブシリーズ009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- アイテムStruc000877 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc000878 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc000879 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- アイテムStruc000880 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- アイテムStruc000881 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc000882 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- 346 more...