The Great Western Railway of Colorado (reporting mark GWR) operates about 80 miles (129 km) of track in Colorado and interchanges with the Union Pacific Railroad as well as the BNSF Railway.

Their route consists of a line from Loveland to Johnstown, Colorado, where it splits to Miliken and Longmont.

Going north out of Kelim is Windsor where once again the line splits to go to their industrial park and Greeley, or Fort Collins.

It has since expanded service to include customers such as Anheuser-Busch, Eastman Kodak and Simplot.

This United States railway company-related article is a stub.