"The Horseshoe Curve" is a famous 2,375-foot-long, three-track railroad curve in Altoona, Pennsylvania. 1995. #altoona #pennsylvania #pennsylvaniacity #pennsylvaniacities #hilly #hillycity #hillycountry #railroad #railroadtown #railroadtowns #railroadcity #railroadcities #historyoftherailroad