The historic Argo Mill and Tunnel in Idaho Springs will soon be reimagined to include a gondola to the mountain top.

In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries ...

State officials finalized a landmark agreement with Union Pacific Railroad that modernizes a century-old lease for the Moffat Tunnel, setting the stage for expanded mountain passenger rail service ...

Union Pacific is generally on the hook for the tunnel, while the state would pay a proportionate share of operating and maintenance costs for the UP-owned tracks along the mountain passenger rail ...

The mile-long East River Mountain Tunnel on Interstate 77 opened on Dec. 20, 1974 after five years, four months and 13 days of work. The total project cost, including design, right-of-way ...

The ore veins looked rich, but miles of costly road would have been needed to get the ore around the mountain to a shipping point. Lacking capital, William Schmidt decided to tunnel through the ...

The Wyoming Department of Transportation said on social media that geologists and bridge engineers with its team were "en route to assess the tunnel infrastructure." The crash happened around 11: ...

The 13-mile-long San Jacinto Tunnel was bored through the mountain in the 1930s by a crew ... mad rush and filled the shaft to the top. Miners scrambled up the 800-foot ladder to the surface ...