Correct. MOT it is. For what it's worth, the "switcher" is an Alco Army Transportation Corps unit. C-C unit with regagable trucks. It's a little smaller than most contemporary C-C road units built for domestic consumption, but a good bit bigger than most domestic switchers. About on par with a GP7, but with an extra axle to distribute the weight better on light rails. Sort of a slightly miniaturized RSD-4/5. (Same prime mover, but smaller and a little lighter.) But it's really road power more than a switcher. It's just . . . they work so well as switchers.
Anyway, that was part of a little story. I was still volunteering with the steam crew at the time. This was a few months after our last run before the last of us finally drifted away from MOT. UP had a traction motor breakdown on the way up the hill, so they stashed their busted loco at Barretts. (And weren't they glad they hadn't pulled the switch like they'd threatened a dozen times before.) They sent to Jeff City local to pick it up a couple days later, along with a carload of coal for UE that had had a hotbox a day or two before that. (And subsequently had a truck changed out to get it moving again.) Which is when I got there and saw the GE . . . AC4400W? (God I hate GE designations.) "Hey guys, what's up with that shiny new GE whatsmabob sitting out in the yard ticking away?" Man, I thought we had a new donation. But of course, their locomotive got a bit buried under projects getting shuffled around, so unburying was necessary. (I don't think the volunteers intentionally created a switching puzzle for UP, but . . . I wouldn't put it past all of them.) Anyway, they reshuffled the deck a little, picked up their locomotive, and then we cleaned up the mess. And even those of us who had real work to do found a good excuse to watch and, in my case, document this rare thing of beauty.
UP stops in Barretts Missouri
UP With Their Prize
UP works the Barretts Yard
Shuffling the Herd
The one you saw came last:
The Big Three
I call it big three as I managed to bag an ALCO, GE, and EMD unit in one shot. Two is easy. Three is actually something of a challenge.