| Here is a postal card entitled "Diesels on West Slope of Horseshoe Curve." No Postmark. Caption On Reverse: "Diesel freight descending the West Slope of the Horseshoe Curve just west of Altoona, Pa. Color Photo by Sheldon L. Burns." The numbers of these three Pennsylvania Railroad locomotives are not recorded, but all of them were built by GM-EMD and rated at 1,500 horsepower each. The exact date is not recorded. |