Tunnel No. 41
Tunnel Number 41, or the Big Hole, is a single-track railway tunnel underneath Mount Judah in the Sierra Nevada, near Norden, California. It is owned by the Union Pacific Railroad, in service as a part of the Roseville Subdivision of the Overland Route. Daily freight trains as well as Amtrak's California Zephyr utilize the line.
| Overview | |
|---|---|
| Other name(s) | The Big Hole, Summit Tunnel |
| Line | Roseville Subdivision |
| Location | Norden, California |
| Coordinates | 39°18′18″N 120°19′3″W |
| Crosses | Donner Summit |
| Operation | |
| Opened | 1925 |
| Owner | Union Pacific Railroad |
| Traffic | freight, Amtrak |
| Technical | |
| Length | 10,325 ft (3,147 m) |
| No. of tracks | 1 |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Highest elevation | 6,887 ft (2,099 m) |
| Tunnel clearance | double-stack container capable |
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