Laying over at Mackinaw City, Michigan on September 3, 1959 is Pennsylvania Railroad FP7A 9871, at one end of an A-B-B-A combination of which the other two units are hidden behind a weather-beaten cabin car (PRR lingo for "caboose") and a string of boxcars. My brother, David V. Leonard, was the photographer. (The entire consist is visible in my photo taken at the same time.) The unidentified B unit is a standard F7B model, as Electro-Motive built no FP7 B units. Unit 9871 came from EMD in 1952, in the PRR's class EFP15.