There is a small paperback that is sold in the SVRy Gift Shop and Depot titled Steaming Toward Sumpter 1890-2002. It has chapters by several members of SVRR. There are several interesting photos from the past to the present. My copy is the second edition.
Integral to Eastern Oregon from 1890 to 1947, stories and photos about the SVRy are undoubtedly in several books. One such book is Sumpter Valley Days by Ernest Hudspeth. Not many photos, but stories about life in Sumpter Valley. Another books is Gold and Cattle Country by Herman Oliver. Mostly about life in the John Day Valley, it nontheless has several interesting photos of the SVRy plus a couple stories of riding on the train with cattle.
dan