|Horseshoe Curve-1966. Here is an original telephoto view that I took at the Pennsylvania Railroad's Horseshoe Curve near Altoona, Pennsylvania, during May of 1966. Shown here (L to R) is PRR engine #5760 and two others whose numbers are not legible. #5760 is an EP-22 built by EMD in 1951 and rated at 2,250 horsepower. They are pulling a 17-car westbound mail/express train under four-track Signal Bridge #2417, and passing a slow-moving ore train at the same time.