Due to track work all throughout the railroad, the timeframe of the SU-100 & SU-99 was very irregular in the end of July 2017. Due to that, the SU-99 made a rare daylight trip up the Delaware Division, seen here at Hancock.
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.