Two NS SD40-2s run light to Slateford Jct where they will couple up to DL train PT97 and assist it West to East Stroudsburg. The abandoned DL&W cutoff can be seen in the background.
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.