yes they are, i belive that one of the crops harvested in the area required the use of reefers and still does if some of carloses pictures have anything to say about it
i think the reason for operating in this way was that when they made a crew change on west bounds at chama they had enough time to take any standard gauge local buissness south of alomosa with them and switch industries as they went?
another explanation is that narrow gauge crews were used west of alomosa even on the runs that had all standard gauge buissness so you would wind up with a narrow gauge engine and caboose handeling an otherwise exclusively standard gauge train that went only as far as antonito