Historic Calhan Rock Island Railroad Depot (Calhan, Colorado). According to the History Colorado website: "The 1906 depot served the Chicago, Rock Island and Pacific Railroad on its route between Kansas and Colorado Springs. It is one of only three surviving depots of the Rock Island Railroad in Colorado remaining on their original site. The Rock Island slipped into bankruptcy in the early 1970s, and in 1993 94 the rails were pulled up and sold for scrap." The depot was placed on the National Re