In chronological order:
Some of these links may be broken now.
From now on, please look at http://dematerialism.net/railroad/newrailroad.ppt and, perhaps, forget the rest unless you have oodles of time. However, the eleven photos at are quite good if I do say so myself. I think I should add a shot looking West on Main Street from the Sweetwater Creek. Then, they will cover the subject pretty well.