I remember going through Rawlins as a kid riding the UP City of Portland - curious to see if I remembered anything about the depot. Here's a link to some pictures on Wikimedia commons https://commons.wikimedia.org/...ific_Railroad_Depot_(Rawlins,_Wyoming). Its quite a building - lots of Romanesque flourishes - now owed by the city. The pictures are pretty good in terms of providing some level of detail - depending upon how much "rivet" counting you're gonna do.
Its listed in the National Register of Historic Places, where there might be more info. I wonder if UP has any information or pictures in their history site.