From my OA-OZ book....
Cook car #04417 and Sleeping Outfit #04516 were fitted up and assigned to rotary OY on March 1924. At a later date, Kitchen Diner #04280, Enginemen #04545, and Sectionmen #4258 were assigned to OY. In 1958, several ex-postal cars were rebuilt to replace some of the box car outfit cars.
Auxiliary engine tender water car from narrow gauge locomotive #167 (4-6-0, T-12) was assigned to OY in March 1935 (AFE5388), cost $280.00. This car was retired in June 1961 (AFE 4955) and dismantled at Alamosa.
In 1958, the Alamosa shops converted a Union Tank Line (UTLX) oil tank car to auxiliary tender service with OY. This car was numbered 0472.