From an October 2005 visit to Montana three SD35s lead the Day Gas east at Perma. I was probably here to see 4449 but picked up this train as a very nice bonus. The backlighting worked well on this train.
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.