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
- 7450 more...
- 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
- ItemBB034211 - Northern Pacific Engineering Drawing: Schedule Electrical Device, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034212 - Northern Pacific Engineering Drawing: Control Desk Details, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034213 - Northern Pacific Engineering Drawing: Light Details, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034214 - Northern Pacific Engineering Drawing: Power and Signal Messenger, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- ItemBB034215 - Northern Pacific Engineering Drawing: Electric Service Details, Bridge 3 - Snake River, East of Ainsworth Junction, Washington, undated
- 269 more...