I was in Rockland this afternoon, and drove past the MERR yard. Driving southward on Rt.1, I took note of all the freight cars in there*, and then remembered the query about the caboose. Reversed direction at Pleasant St., and came back along the south side of the yard to see if I could spot the caboose.
It is sitting near the old freight house, still maroon/red, with no lettering that I could see. The weather was crappy and I didn't feel like getting out of my truck for a closer look. (My camera battery crapped out while I was there, too.
*Four ATSF covered hoppers, a couple of different types, most likely "Chemrocks." The snowplow was sitting there looking bored, with a couple of ballast cars behind it. The longest string of CN 374-series covered hoppers I have ever seen on the Rockland Branch was on another track, maybe a dozen of 'em. I'm used to seeing those mixed in various combinations with the Dragon (DPCX) Flexi-Flo cars, going to Canada with cement or returning empty.
There was also a tamper that I haven't seen before, and another (small) piece of MoW equipment sitting on a stub track that connects to the turntable but has no connection on its east end. The tamper looked recently painted, but was unlettered.