Amtrak’s westbound California Zephyr works its way up the storied Soldier Summit grade at Colton, Utah. A Utah Railway SD45 leads a train of empties eastbound down the grade, while storms rage just over the ridge.
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.