For starters, the Dorman collection at the Friends of the C&TSRR has what you're looking for:
[
ngtrainpics.photoshelter.com]
Not sure how well the search function is working today, but go to advanced search and type in "Alamosa shops", all dates, and you'll get pages of posts, some of which have photos.
Another great source is the book 'Rio Grande Narrow Gauge - The Final Years, Alamosa to Chama' (R.Robb, 2001), still available. Also Dorman's Alamosa book is really good.
A great map of the shop and yard is available from the RGM&HS store:
[
www.drgw.org]
A number of other books also have good Alamosa stuff, like Richardson's Chasing the Narrow Gauge books and the two Rio Grande Narrow Gauge in Color books.
Also check out the photo collections online of John West and Fritz Klinke.
Mike