| Here is a photo from David W. Seidel's 2008 book entitled "Images Of Rail: Horseshoe Curve," page 69. Partial Caption: "During June 1962, the PRR operated new General Electric U-25B diesel-electric locomotives 2500, 2508, and 2502 over Horseshoe Curve. Rated at 2,500 horsepower, they are equipped with train-phones and dual controls. Railroaders dubbed them 'U-Boats.'" Shown here (R to L) are Pennsylvania Railroad engines #2500, #2508, and #2502. All were built by General Electric in 1962: #2500 and #2502 were built in August, but #2508 was built in September. Barely visible in the distance is PRR K-4S (4-6-2) "Pacific" #1361. |