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- Railroad tunnels 14
- Railroad tracks 9
- Railroads 7
- Rivers 6
- Tunnels 6
- Railroad trains 4
- Railroads--Employees 4
- Construction equipment 2
- Railroad construction workers 2
- Railroad tracks--Design and construction 2
- Bridges 1
- Building, Stone 1
- Cliffs 1
- Columbia River Valley 1
- Columbia River 1
- Construction workers 1
- Dams--Design and construction 1
- Electric lines 1
- Persons 1
- Railroads--Design and construction 1
