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 3003 - Maintenance Facilities
- 819 more...
- ItemStruc006942 - Northern Pacific Engineering Drawing, Car Shop at Helena, Montana, 1952
- ItemStruc006943 - Northern Pacific Engineering Drawing, Car Shop at Helena, Montana, 1914
- ItemStruc006944 - Northern Pacific Engineering Drawing, Car Shop at Helena, Montana, 1955
- ItemStruc006945 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1957
- ItemStruc006946 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1957
- ItemStruc006947 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1957
- ItemStruc006948 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1957
- ItemStruc006949 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1957
- ItemStruc006950 - Northern Pacific Engineering Drawing, Sand Facilities at Helena, Montana, 1960
- 483 more...