Others here can do a better job of answering this, but I would suspect any use over Marshall Pass was very limited after 1923 when the K-28s showed up on the scene. And by 1925 K-36's were arriving, pushing the smaller power to the more remote, less travelled regions.
There is a picture of 375 double heading with a smaller 2-8-0 on the Farmington branch from the mid-20's. The train had a banner about the first oil shipment by rail from Farmington. I believe the phot o is in "Durango-Always a Railroad Town" by Dorman.
My guess for 1929 would be out of Durango, in use as the "Gato helper", etc.