The Denver, South Park, and Pacific Railroad was a historic narrow gauge railway that operated in Colorado in the western United States in the late 19th century. The railroad opened up the first rail routes to a large section of the central Colorado mining district in the decades of the mineral boom. The railroad took its name from the fact that its main line from Denver ascended the Platte Canyon and traversed South Park. The company operated as an independent railroad from its founding in 1872 until it was sold in foreclosure proceedings in 1889. Its lines later became part of the Colorado and Southern Railroad. In the first half of the 20th century, nearly all the company's original lines were dismantled or converted into standard gauge. A section of the standard gauge line between Leadville and Climax is operated as a passenger excursion railroad called the Leadville, Colorado and Southern Railroad.
Source: Wiki [url]http://en.wikipedia.org/wiki/Denver,_South_Park_and_Pacific_Railroad[/url] />
The GR is for Romley