Tunnel No. 41
The 292nd longest tunnel in the world
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.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).