UP Steam Reference?

Anybody got any links to historical steam loco sites? Specifically SP and UP.

 

Nothing specific but this is a good place to start:

Steamlocomotive dot Com

 

This site has some Southern Pacific steam loco pictures:
http://espee.railfan.net/espee.html

 

I found that one a little while ago. So far they've got a ton of Video links and references.

 

Assuming photo collections are what you're looking for...
On duty at the railroad UP and SP transition era.
PROTO PHOTOS UP (and SF) transition era.
The Fred Matthews Collection - Pentrex SP GS's.
http://www.yesteryeardepot.com/espeerr.htm
http://www.yesteryeardepot.com/uninpac.htm