| Here is the seventh of 18 photos by Fred McLeod that are included in a souvenir brochure entitled "Horseshoe Curve; Pennsylvania Railroad; Altoona, Pa." Photo Caption: "Twin Unit Diesel with the 'Juniata.'" Shown here (R to L) are PRR engines #5751 and another "AP" Class unit whose number is not recorded. Both are AP-20's built by the American Locomotive Company and rated at 2,000 horsepower each. #5751 was built in October of 1947, later regeared for freight service and reclassified as an AFP-20, and retired in September of 1962 after just 15 years of revenue service. In this context, this A-B set is powering Train #72 down the Allegheny Mountains and around the Curve to Altoona and points East. |