OK, since you asked for more. The Frisco had five EMD SW7s, SLSF 300-304. Like the earlier NW2s, none had multiple unit (MU) connections or capability, so they usually worked alone. The picture of SLSF 301 is from the summer of 1979, but I am not sure of the location. Probably around Lindenwood somewhere here in St. Louis, or possibly in Tulsa. I took a business trip to Tulsa back then, and snapped some Frisco pictures there during free time. SLSF 304 is at Lindenwood in September, 1979. The picture was taken from the I-44 pedestrian bridge steps, I-44 is right behind us. Lindenwood had two or three of the five SW7s assigned to it. Ken