I will tell you about it. For those of you that might have read my post asking about the Diesel Engine Guide Book, I was wanting it so that I could identify the locos used on the local that goes through my town. I asked a professor from a near by college (who is a avid railfan and has a webpage for it) about it and he game me this link http://www.rrpicturearchives.net/ I used it along with some pictures that he has on his sight of what I think are of the local train that I am wanting to model, and I was able to come up with the needed information about them as well as some additional pictures.
I found it interesting and useful as well, and I just wanted to share it with all of you. I hope that it might help some of you as it has helped me as well.