For color photos Steve Goen's Cotton Belt Color Pictorial is probably the best. Goen used a number of R. S. Plummer photos to illustrate early Cotton Belt diesels. It is out of print and costly to come by. Joe Strapac's Cotton Belt Locomotives gives a detailed locomotive history of the subject up to the mid 1970s.
You might find this link to be useful: http://ncespee.railfan.net/
The following links may be resources for your search of things Cotton Belt and or Southern Pacific.
Hope they get you pointed towards the answers you seek; Also you might check Wikipedia's site for information on SSWRR and Cotton Belt.
Good Luck with your search!
http://www.sphts.org/resources/links.php
http://www.facebook.com/pages/Cotton-Belt-Rail-Historical-Society/127065434004138
I'm needing for modeling purposes to find a book or a source for Cotton Belt Diesels in color before the SP merger. Anyone care to recommend anything?
Thanks in advance.
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