Photograph of a train passing between mountains near a lake. Characterized as one of the most fantastic scenes on any railroad - this is the Pennsylvania's Horseshoe Curve shortly after sunrise on a spring morning in 1954. This was the centennial year of Horse Shoe Curve, which was built in 1854. The Mountain in the background in the center of the Curve is Kittaning Mountain.

This photograph depicts the most famous stretch of railroad main line in the world as it appeared in the autumn of 1951- the Pennsy's Horseshoe Curve, located in Kittanning Gap in Pennsylvania. In this scene a Pennsylvania K4s locomotive acts as a "helper" on the head-end of a diesel powered train.

The Delaware, Lackawanna and Western Railroad's predecessor to the Phoebe Snow, the Lackawanna Limited, second section of train No. 6 arriving at Slateford Junction, Pennsylvania, on the Delaware Water Gap, in September 1949. The train is headed by a Pacific type locomotive.

One of the Pennsylvania Railroad's Mail-Express trains, headed by a K4s locomotive with a standard coach on the rear-end, rolls through the Pennsylvania countryside on a cold, dismal day in January 1923.