Go back to the most famous battleground between steam and gradient in the world. Here is mightiest steam in the Pennsy stable -- in fact on any railroad roster. Rare b&w footage from the 1930s and 1940s shows K-4s, M-1s (Mountains), Js (2-10-4 Texans), the famed I Class Decapod (600 2-10-0s, the largest fleet in the world), even E-6 Atlantics, heavyweight Pullmans and brass rail observations climbing the curve. Sync sound scenes include the famous 'banshee whistle'. See many high-speed run pasts rounding the curve from trackside plus views from on board and in the cab.

Color footage from the 1940s and 1950s shows double and triple headers on the famous Horseshoe Curve in summer, the T-1 4-4-4-4s and Q-2 4-4-6-4s. The DVD closes with the arrival of the diesels: a Baldwin Centipede, E-7s and E-8s and, finally, the lo-nose hoods.