As a Subscriber you will see all 387 images which will give you a far better sense of what was happening within a single year. At the moment you can see 10.
Alfred Hart, 1866-1869 (taken) 1870 (after, print), First Construction Train passing the Palisades, Ten Mile Cañon, [Watkin's Pacific Railroad], Stereocard, J. Paul Getty Museum, LL/50553
Alfred Hart, 1866-1869 (taken) 1870 (after, print), First Construction Train passing the Palisades, Ten Mile Cañon, [Watkin's Pacific Railroad], Stereocard, half, J. Paul Getty Museum, LL/50554
