Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3001 - Bridges
- 7445 more...
- ItemBB034202 - Northern Pacific Engineering Drawing: Operating Drum Assembly, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034203 - Northern Pacific Engineering Drawing: Power Circuits, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034204 - Northern Pacific Engineering Drawing: Control Details, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034205 - Northern Pacific Engineering Drawing: SHEM Control Circuits, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034206 - Northern Pacific Engineering Drawing: Remote Indicating System, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034207 - Northern Pacific Engineering Drawing: Remote Control System, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034208 - Northern Pacific Engineering Drawing: Control Circuits, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034209 - Northern Pacific Engineering Drawing: Operating Procedure, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034210 - Northern Pacific Engineering Drawing: Light Circuits, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- 274 more...