From the Wikipedia page 
The Cotton Belt Rail Historical Society, Inc. (CBRHS) is a non-profit organization that is dedicated to the restoration and preservation of the history of the St. Louis Southwestern Railway (SSW) (Wikipedia page ), commonly referred to as the "Cotton Belt".
The CBRHS is headquartered in the Arkansas Railroad Museum (Wikipedia page ) located in the former SSW yards at the end of East Second Avenue in Pine Bluff, Arkansas.
The society accepts donations of railroad memorabilia, particularly historical items about the SSW and other railroads that operate, or have operated, in Arkansas and East Texas.
The website is