Canon City, COLORADO - Sky Line Drive - Denver & Rio Grande Railroad  Postcard:  Skyline Drive is a scenic roadway in Cañon City, Colorado. It was built by inmate labor in 1905.  The road starts from U.S. Highway 50 and gradually inclines up the side of a ridge. When the road crests, it winds, climbs, and falls like a roller coaster until near its end, where a scenic outlook overlooks both the city to the east and the highway to the west.  The single-lane, one-way road rises about 800 feet (240 meters) above the surrounding terrain. There are no guardrails despite sharp drop-offs, and the drive is about 3 miles (4.8 kilometers) long.  The Denver and Rio Grande Western Railroad (reporting mark DRGW), often shortened to Rio Grande, D&RG or D&RGW, formerly the Denver & Rio Grande Railroad, was an American Class I railroad company. The railroad started as a 3 ft (914 mm) narrow-gauge line running south from Denver, Colorado, in 1870. It served mainly as a transcontinental bridge line between Denver and Salt Lake City, Utah. The Rio Grande was also a major origin of coal and mineral traffic.  The Rio Grande was the epitome of mountain railroading, with a motto of Through the Rockies, not around them and later Main line through the Rockies, both referring to the Rocky Mountains.  This Divided Back Era (1907-15) postcard is in good condition.