Allegheny Railway Tunnel
Gallitzin, PA, USA
Originally built in 1904, the Allegheny Tunnel is the highest and longest tunnel on the original Pennsylvania Railroad system, approximately 3,605 feet (1,100 m) in length, at 2,167 feet (660 m) above sea level. In 1994, the tunnel was expanded to accommodate two parallel tracks and double-stacked container cars below its arches.
PENETRON ADMIX was blended into the shotcrete mix and applied – along with additional reinforcing – to the interior of the tunnel entrance. The wider entrance structures of the tunnel were also upgraded with a concrete mixture treated with PENETRON ADMIX.