Santa Fe SD45 #5365 sitting under the sand tower in the Enid Yard. Sand is used to avoid wheel slippage when starting a train. Wheels slipping or spinning can damage the electric traction motors driving the locomotive. The sand was loaded on the locomotive from this tower. Engine #5365 will later take the XENAC1-27 train to Arkansas City.

Yard switcher GP7 #1314 and slug #117 (ex-Union Pacific GP9B #143B) can be seen in the background. Often called a "calf", a slug is basically a locomotive without a prime mover. It's traction motors receive electrical current from a powered locomotive, sometimes called a "cow". The "cow-calf" arrangement results in greater starting and low-speed tractive effort required for yard switching operations.