Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Série004 - Northern Pacific Railroad Company
- Sous-série009 - Engineering Records
- 008 - Physical plant drawing
- 007 - Track
- 25 en plus...
- PièceStruc006850 - Northern Pacific Engineering Drawing, Load Adjuster at Mandan, North Dakota, 1968
- PièceStruc006851 - Northern Pacific Engineering Drawing, Load Adjuster at Mandan, North Dakota, 1968
- PièceStruc006852 - Northern Pacific Engineering Drawing, Load Adjuster at Livingston, Montana, 1960
- PièceStruc006853 - Northern Pacific Engineering Drawing, Load Adjuster at Livingston, Montana, 1960
- PièceStruc006854 - Northern Pacific Engineering Drawing, Load Adjuster at Pasco, Washington, 1957
- PièceStruc006884 - Northern Pacific Engineering Drawing, Interlocking Tower at South Portal at Seattle, Washington, 1939
- PièceStruc007197 - Northern Pacific Engineering Drawing, Master Retarder at Pasco, Washington, 1970
- PièceStruc007198 - Northern Pacific Engineering Drawing, Master Retarder at Pasco, Washington, 1978
- PièceStruc007199 - Northern Pacific Engineering Drawing, Crest Office at Retarder Yard at Pasco, Washington, 1970
- 294 en plus...