A section of the Greeley, Salt Lake and Pacific Railroad line that carried loads of quarried stone to Fort Collins and Greeley for 100 years was named one of the state's most endangered historic places Thursday by Colorado Preser-vation Inc. The 0.8-mile section of rail bed, which is on the National Register of Historic Places, was recognized because of the threat it faces from a 60-inch pipeline proposed by the city of Greeley, said Jonas Landes, endangered places coordinator for the nonprofit organization.