Building a WW1 Diorama/Layout - Model Railroader Magazine

Hey all, I am in the very beginning stages of researching a layout that will be based in the Western Front of WWI.  This would be the Germany France/Belgium Border.  Ive got quite a bit of space, but I think I'll be going with HO Scale because I want to dedicate a good portion to the actual trenches on the front lines.

 What im having problems with is finding information on train activity/railroads in Europe during that time period.  Im not a railroad expert so im not exactly sure what to search for, searching for WW1 trains, railroads is not coming back with much help.

 So im asking you guys, where should I look?  I want more information about the locomotives, cars, etc..that were used to transport supplies and troops to the front. Or close to the front.

 Also, if any of you can recommend a hobby shop in the Kansas City area that would be greatly appreciated.  I havent been really involved in this hobby since I was a young child, so am very out of touch.  

 Also, any information or links to incorporating electronics in dioramas, such as sounds(explosions, gunc shots) to actually hooking up figurines to rails(not railroad rails, but movement rails) would be greatly appreciated as well.  I'd like to go as realistic as possible, and have as many things moving about as possible not just trains. 

Thanks in Advance, and I will probobly just keep this thread updated with my progress/lack therof and other questions.