Interested in knowing just which model locomotives are used.
GP9s and GP20s mostly. Roster is on Diesel Shop:
That picture of a D&I train in the link is 2 blocks north of my office. Until they re-routed a bit of the line onto BNSF, it used to come right through the edge of our parking lot! Crossing lights were 100’ outside the front door. You knew when the train was coming through.
The SD 39’s are neat to see. You have to look close to see that they aren’t D&RG units. D&I used to have some odd I think ex-Milwaukee Road units, called something funky, like GP 10(?), that had little*range hood *sort of things on the side.