Colorado National Historic Landmarks in Colorado National Register of Historic Places in La Plata County, Colorado National Register of Historic Places in San Juan County, Colorado Railroad museums in Colorado Railroad roundhouses in Colorado Railroad-related National Historic Landmarks Spin-offs of the Denver & Rio Grande Western Railroad Transportation in La Plata County, Colorado Transportation buildings and structures in La Plata County, Colorado Transportation in San Juan County, Colorado Rail infrastructure on the National Register of Historic Places in Colorado Railway lines on the National Register of Historic Places