Thank you for your help.  That drawing Greg linked really showed it all.  Yeah, not sure how I missed it, but the part is available in parts list.  Kinda pricey but everything is.  I should have this Wonderland Express going soon.
Thank you again.
JIm

Yeah, the cap wasn't giving up.  I couldn't see a slight separation to pry at the cap..but looking closer, noticed the spokes, weight, and cap might be one piece.  So I'm here (see pic), but still not "there".  Looks like the motor/gear assembly side brackets are pin punched together. 
Getting the drive axle/gear assy out would probably result in total disaster.  Not sure where to go from hear...gonna call Bachmann and see what they say. 
Thank you for the kickbacks.
Jim

Not sure how to get the wheels off to get to the gear.  Any help would be appreciated.
Thank you,
Jim