In any discussion of additions or modifications to the Chama Yard there are "viewscape" requirements agreed between the Commission and SHPO back in 1994 that limit what can or cannot be done. I've been able to attach this document to this post by using the jpgs of the three pages. The Forum doesn't accept a pdf version which I also have. The jpgs are hard to read, but the best we can do.
Since this is an important planning document I thought it best to add it to the Forum. This document was instrumental in leading the Friends to plan the RVC toward the North end of the Yard where it does not violate the viewscape specifications. This document is likely to also be important in any evaluations and studies about adding a turntable and roundhouse.