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 3008 - Tunnels
- 40 more...
- ItemBB017626 - Northern Pacific Engineering Drawing: Shop Plan - Signal Switch, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017627 - Northern Pacific Engineering Drawing: Shop Plan - Sketch Plan, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017628 - Northern Pacific Engineering Drawing: Shop Plan - Bent Detail, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017629 - Northern Pacific Engineering Drawing: Shop Plan - Bent Detail, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017630 - Northern Pacific Engineering Drawing: Sheave Housing, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017631 - Northern Pacific Engineering Drawing: Shop Plan - Sketch Plan, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017632 - Northern Pacific Engineering Drawing: Shop Plan - Sketch Plan, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017633 - Northern Pacific Engineering Drawing: Shop Plan - Pickup Assembly, Bozeman Tunnel, Muir, Montana, undated
- ItemBB017634 - Northern Pacific Engineering Drawing: Vertical Slide Door, Bozeman Tunnel, Muir, Montana, undated
- 80 more...