The mechanical service doors are hard to see in some of the pictures. The D&RG 2 right side picture that Dave posted is later than the left view marked Skagway, I believe. Both pictures show the mech service doors under the front door as still being T&G wood. I think the left view has all wood doors, and the right view has them replaced with metal. I would sure like to see the original picture of the left side mismarked as Skagway, I bet it is a lot more clear.
All just guesses though, hope some earlier pics of OM surface some day.