The Cumbres & Toltec Scenic Railroad is a historic steam-powered railroad located in the San Juan Mountains of Colorado and New Mexico, USA. It is the highest and longest narrow-gauge steam-powered railroad in the United States, with 64 miles of track winding through
From Wikipedia
Cumbres Pass, elevation 10,022 ft (3,055 m), is a mountain pass in the San Juan Mountains in Colorado, United States. The pass is traversed by State Highway 17 and the Cumbres and Toltec Scenic Railroad. The highway has a moderate 5.8% approach on the north side and a gentler, 4% approach on the south side. It is rarely closed in winter and does not normally cause problems for vehicles, since the road is not a major through highway.