Pennsylvania Railroad FP7A units 9843 and 9855 idle near the roundhouse at Mackinaw City, Michigan, in this photo my brother, David V. Leonard, took on September 3, 1959. These 1500-horsepower units came from EMD in 1952 as part of the PRR's class EFP15. EMD's FP unit was equipped with a steam generator and water tank for train heating, and was four feet longer than the standard F unit. The PRR's summer-vacationer train to Mackinaw City, the Northern Arrow, for which these units may have been the power, was discontinued in 1961. (In steam days it was pulled by a K4 Pacific, or even by a 2-10-2.)