Too much mountain tonnage!
At the town Cowan, TN CSX Q212-05 (Waycross,GA-Louisville,KY) slowly eases its way down the Cumberland Plateau with a pair of C40-8 pulling the long empty northbound auto train to the siding at the on the south-end of Cowan (MP J-87.0 SE Cowan) to meet two loaded coal buckets. Depending on the mountain tonnage on some of the freights that traverse the subdivision some freight doesn't require pusher service, like Q212, even though the train is right at 7,000+ feet, the combined horse, and the cars on the train are empty the power could handle the proper tonnage to get over the plateau, but sometime you can overthink, and miscalculate the mountain tonnage which can result to trains stalling over this section of railroad.
Looking back down memory lane at the last generation of GE spartan cab which includes the six axles C series and four axles B series throughout the various of Class 1 Railroads in North America throughout the years.
