Here is a nice roster shot of Union Railroad MP15DC yard switcher #16 at the Hall, PA yard. EMD built the switcher for the Union RR in June of 1975. It was spotted still working for the URR in 2020 after 45 years. Roger Durfee took this color slide which is now in my rr collection.
A 3-unit set of MP15s at Kenny Yard
Looks like the 16 just got a near heart....