Pennsylvania Railroad | Gallitzin, Pennsylvania | Allegheny Tunnel exhaust fan | June 1976 | Paul Geiger photograph | Morning Sun Books collection | 35mm Kodachrome slide | The Gallitzin tunnels of the former Pennsylvania Railroad are at the summit of Allegheny Mountain west of Altoona. During the era of steam locomotives, these fans served to blow out the exhaust of passing trains as they went through the tunnels. The fans remained at the site for many years after the steam era, until removed by Conrail.