You may be right on the first one Bruce. I thought it was Santa Fe. The other photo floating around with the inspection car on the turn table also jogs my memory. I'm thinking it is safe to say there was never a round house per say in Santa Fe, just only the dual gauge turn table. It is a shame there was never a photo taking of the turn table looking south, only the one looking north with the inspection car on the table.
Ethan
We have witnessed valley
and plain and crest,
Canon and pass we've scanned;
We have seen the best
of the glorious West,
by the trail of the Rio Grande
-Author Unknown