Hiwassee Loop, also known as the Hook and Eye; 2 miles NNE of Farner, Tennessee at on the former Atlanta, Knoxville and Northern Railway now operated as a heritage railroad by the Tennessee Valley Railroad Museum, which operates excursion trains from Etowah, Tennessee to Copperhill, Tennessee via the loop, as well as trains just to the loop and back from Etowah. Georgetown Loop, at Georgetown, Colorado at on the former Colorado Central Railroad. The spiral was completed in 1884, abandoned and dismantled in 1939, rebuilt between 1972 and 1984 and is now owned by History Colorado and operated as the Georgetown Loop Railroad. The MAX Red Line, a light rail line in Portland, Oregon, loops over itself at in the vicinity of the Gateway Transit Center. In the Loop District of the Alaska Railroad at between mileposts 48 and 51 northeast of Seward, Alaska, there was a spiral and a horseshoe curve both on an extensive range of timber trestles up to 106 feet high. Track relocation in 1951 removed all of this but added a new horseshoe at milepost 48. Abandoned spiral at Riflesight Notch Loop at Rollinsville, Colorado at on the former Denver and Salt Lake Railway route over Rollins Pass. The spiral was bypassed by the Moffat Tunnel built in 1928, and was dismantled in 1935. Abandoned spiral called Double Circle, or Double Loop, or The Golden Circle, at east of Eureka, Utah on the former Tintic branch of the Denver and Rio Grande Western Railroad. It was bypassed in 1940 and the branch removed in 1943. Abandoned spiral on the Roaring Camp Railroad at . The spiral was completed in 1963. The spiral was bypassed by two switchbacks after a trestle fire in 1976. See also Spiral bridge - road equivalent Hairpin turn List of spiral tunnels and tunnels on a curved alignment List of steepest gradients on adhesion railways Zig Zag Railways References External links Helixes, Tunnels, Spirals, and Other Unique Trackage Railway track layouts Spirals