Jaime - here is a listing of organizations that are into railroad history. Found only three in the LA/MS/AR area. but they may be able to get you a bit more information than reading annual reports. They can be so BORING!!!

Kansas City Southern Historical Society, Inc.
P. O. 5332
Shreveport, LA 71135-5332
Contact Point: Warren D. Caileff
Email: kcshscaileff@aol.com
Website: http://www.kcshs.org

Queen & Crescent Chapter NRHS
P.O. Box 466
Collinsville, MS 39325
Contact Point: Chapter President Mick Nussbaum
P.O. Box 466
Collinsville, MS 39325
601-626-8365
Website : http://www.queenandcrescent.org/

Arkansas-Boston Mountains Chapter, National Railway Historical Society
P.O. Box 1303
Springdale, AR 72765-1303
Contact Point: Tom Duggan
Email: tomd6@cox-internet.com

Hope this helps.
JIM T