A pair of former Santa Fe SD45-2's lead the L CHI101 Streator turn under the ATSF searchlights in Toluca. These units now wear the H3 scheme are classified as SD40-2R's.
The EMD SD (special duty) series are a strong and reliable kind of locomotive which still serve America's rails today. They have proved themselves reliable by clocking in several million miles of freight service over several decades.