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The following are references to both the original SDP40F and Santa Fe's SDF40-2:

"Kit-conversion: Santa Fe EMD SDF40-2 from Athearn's HO scale kit"    
   Railmodel Journal, March 1999 page 26
   by Gregg Fuhriman

 "Amtrak's SDP40F passenger diesel"
   Model Railroader, August 1992 page 82  
   by Keith Thompson

 "Modeling an Amtrak SDP40F in HO"   
   Railroad Model Craftsman, April 1990 page 53  
   by Bill Manzke

"Amtrak SDP40F Painting Guide" 
   Mainline Modeler, August 1990 page 20  
   by Warren Calloway

"Amtrak SDP40F"  
    Prototype Modeler, July/August 1989 page 20  
    by Greg Larocca

"And passenger service too"
    Railroad Modeler, August 1975 page 40  

"How to SDP40F your FP-45"     
    Railroad Modeler, April 1974 page 26  
    by Wayne Lyndon

"The SDP40F is here!"  
    Railroad Modeler, September 1973 page 8   

"New EMD's for Amtrak - the SDP40F"
    Railroad Model Craftsman, October 1973 page 48  
    by Win Cuisiner