A Weird & Broken Train from eBay... Can I make it Run Again? Workbench Wednesday

Some time back some of my fellow modelers were sharing around an eBay listing for a weird kit-bashed HO scale model train listed "For Parts or Repair." I threw an offer at it, and the offer was accepted. Now it's here and I am going to try to see if I can make a working train out of it. It appears to be a Bachmann DDA40X Chassis with a Walthers Amtrak Superliner and Athearn diesel cab grafted on to it, as well as 2 cut up superliners running behind. This isn't going to be a typical workbench session...