 The line continued building west until reaching the D&RGW close to present day Green River which completed a narrow-gauge transcontinental link with the Rio Grande Western Railway to Salt Lake City, Utah.The line from Pueblo to Leadville was upgraded in 1887 to three rails to accommodate both narrow-gauge and standard-gauge operation.Narrow-gauge branch lines were constructed to Chama, New Mexico, Durango, Silverton, Crested Butte, Lake City, Ouray and Somerset Colorado.