| Overview | |
|---|---|
| Other name(s) | The Big Hole, Summit Tunnel |
| Line | Roseville Subdivision |
| Location | Norden, California |
| Coordinates | 39°18′18″N 120°19′3″W / 39.30500°N 120.31750°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 |
Tunnel Number 41, or the Big Hole, is a single-track railway tunnel underneath Mount Judah in the Sierra Nevada, near Norden, California.[1] It is owned by the Union Pacific Railroad,[2] 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.