From the record
“The Cumbres and Toltec Scenic Railroad, often abbreviated as the C&TSRR, is a 3 ft narrow-gauge heritage railroad that operates on 64 miles (103 km) of track between Antonito, Colorado, and Chama, New Mexico, in the United States. The railroad is named for two geographical features along the route: the 10,015-foot (3,053 m)-high Cumbres Pass and the Toltec Gorge.”
Wikipedia article Cumbres and Toltec Scenic Railroad, CC BY-SA 4.0.
One of 2 National Register listings published here for Archuleta County · listed in 1973 · category: District · built in 1970 · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service