SP Locos in 1948 - 1950 era

Is there a web site where I can search for Southern Pacific locos in the 1948 - 1950 time frame? I’m just getting into the hobby and don’t know where to look. I need to first identify a specific engine (or engines) and then find a manufacturer who makes that model (in HO). I would appreiciate any and all suggestions?

http://espee.railfan.net/espee.html

Or you could join this Yahoo Group: http://groups.yahoo.com/group/Espee/join

What part of the Espee are you looking at to model?

Oakland to Reno, maybe Ogden later on. In HO.

Here is a great resource.

http://www.rr-fallenflags.org/

You might also try the Southern Pacific Historical & Technical Society

Great suggestions. Thank you.