Here are some photos from the NERail Photo Archive. The first one is of an MDOT group tour of the Mountain Division, per the caption by the photographer. Notice the apparent lack of any state owned equipment. The second one is of a hy-rail truck identified by the photographer as MDOT prior to a special excursion on the Augusta Lower Road in 2008. Although the white hy-rail truck is identified as being from Maine DOT I believe it may have actually belonged to Maine Eastern. I was on the special excursion trip and remember seeing a white pickup of similar make, model and body with ME markings on it.
Given how well photographed and watched the Mountain Division is I'm very surprised there aren't any photos of DOT personnel on the Mountain Division in the last ten years. I'm not saying it hasn't happenned, I am saying I find it difficult to believe this would never have been photographed, especially when you consider that almost every single speeder tour of the Mountain Division in the last five to ten years has photographs of the trip, including from photographers who weren't even on the trip, on the NE Rail Photo website.
"DOT Tour of Mountain Division. April '99" by photographer, John Bay, on the Mountain Division at MP P 21.
MDOT Mountain Division Tour, April '99
Hy-Rail Truck identified as "State of Maine Dot truck" by photographer, Bernard Cole II, on the Augusta Lower Road, prior to special excursion train in 2008.
MDOT Augusta Lower Road Tour, May 2008