Hump Yard Photos
I agree with Brian about the book. I bought a copy as soon as I saw it.
Here's a pic of the hump I took at UP's West Colton. The "crest" of the hump, where the cars are released, is ahead of the train, adjacent the small structure and group of trees near the center of the pic.
I've also attached a photo of one of the retarders ahead of the hump. My assumption is that these retarders aid the locomotives in braking the train, as the approach to the hump is slightly downgrade.
Chris