In chronological order:
http://dematerialism.net/railroad/WayburnLayout.ppt
http://dematerialism.net/railroad/stevescolors.ppt
http://dematerialism.net/railroad/oldrailroad.ppt
http://dematerialism.net/railroad/rr_11.26.07.ppt
http://dematerialism.net/railroad/rr_11.29.07.ppt
http://dematerialism.net/railroad/rr_12.22.07.ppt
http://dematerialism.net/railroad/rr_12.22.07a.ppt
http://dematerialism.net/railroad/rr_01.06.08.ppt
http://dematerialism.net/railroad/rr_01.08.08.ppt
http://dematerialism.net/railroad/rr_01.09.08.ppt
http://dematerialism.net/railroad/rr_01.15.08.ppt
http://dematerialism.net/railroad/rr_01.21.08.ppt
http://dematerialism.net/railroad/rr_01.27.08.ppt
http://dematerialism.net/railroad/rr_02.05.08.ppt
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 http://dematerialism.net/railroad/forncrowd.ppt 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.