This story in the Appeal pointed me to another Then and Now book, this one on the Central Pacific Railroad. The website www.cpran.com has details and sample images from Lawrence K. Hersh’s book The Central Pacific Railroad Across Nevada 1868 & 1997, currently in its second printing. It matches up photos of the Transcontinental Railroad in Northern Nevada taken by Alfred A. Hart in 1868 with modern-day photos of the same scenes. Looks like a good read.