The following links are highly recommended for expanding knowledge on what is easily the world's greatest hobby.

Atlantic Coast Line / Seaboard Air Line History
  http://aclsal.org

ET&WNC:
www.urbaneagle.com/slim/etwnc.html                                - Great ET fan site
www.mindspring.com/~cfordart/etwnc/home.html              -Another super resource
www.mindspring.com/~cfordart/etwnc/histsociety.html      - The Historical Society


National Railway Historical Society
  www.nrhs.com                                                          -The Grand-daddy of em all !

Southeastern Shortlines
   www.taplines.net                                                    -A premier web resource

Southern Railway
www.sourwy.railfan.net                           -A grand SR site with tons of information!
www.srha.net                                            -The official historical society
southern-railway.railfan.net/sry/              -Another site with great features!