After the "southern" clear up the north-end of the CSX controlled diamond, AC-Dispatcher out if Atlanta, give "Calhoun turn" CSX A701-02 (Calhoun,GA-Chattanooga,TN) the signal to proceed out of the 4,200ft (MP WA-98.7 Middle Dalton) long Dalton Yard tight behind CSX Q580 which is almost two blocks ahead. What is normally a turn that has a pair of 4 axles motors as a power of choice, the turn is using big muscle instead which consist of a 4200 series SD40-3, and a 7600 series C40-8W. We can only imagine that either the Calhoun Turn is becoming to heavy for 4 axles power or that was the only available power in Calhoun, GA that is assigned to the crew.