Sharp looking Wheeling 7001 works at Hartland Yard. According to the NSDash9 Wheeling roster this unit was built 1/1980 as UP 3664 with rebuilding completed at Brewster 3/2017, including the addition of PTC.
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.