Caption: GO FP7 APCU #911 trails GP40-2M #724 and an unknown number of bilevels on a westbound train past Willowbrook Yard in Mimico. The FP7 was only equipped with a head end power generator, hence the designation "APCU" (Auxiliary Power Control Unit), which was used to supply hotel power to the coaches and serve as a control cab when leading. During the '80s, GO often placed one of these units in front of the motive power as crews preferred this due to the much quieter work environment compared to the cab of a GP40. Image is scanned from a slide in my collection; original photographer is not listed. I sure miss these days of GO operations though; they were a heck of a lot more interesting.