Does anyone happen to know the builder of SSW 31000-33499? Here is a photo:

http://www.railgoat.railfan.net/photos/sp/ssw/ssw032000a_cotton_belt_public_relations_sp_lines.jpg

I have that they were built between 1923-25, but don't know the builder.

Lee A. Gautreaux - The RailGoat
http://www.railgoat.railfan.net/