Trains pass through Horseshoe Curve in Altoona, Pennsylvania approximately every 12 minutes. This rail line is a major east-west corridor, so trains come and go frequently throughout the day. During peak times of travel such as rush hour or holiday periods, the frequency of train traffic at this busy location can increase significantly. On average, up to 30 freight and passenger trains traverse the area each day. The historic site also attracts many visitors who use it as an observation point for watching passing trains from different angles along its curves - making it one of the most popular tourist spots on the entire eastern seaboard!