Lee F., you are the genius.  You are correct that it is a Weaver and not a Williams caboose.  I did manage to get it disassembled, but remain mystified as to why the wires from the center rail pickups cooked.

I can't believe I didn't even get the brand name right!

My daughter's boyfriend found 2 screws: under the frame after your remove both truck screws and take away the frame.  Nothing on the ends of the car or on the bottom of the floor as earlier posts suggested.  The car is letter WM round herald #1882.  Not sure if that helps.  Will try to disassemble this weekend.  Another ebay adventure!

Thank you for the suggestion, however, there is no screw on the either end of the caboose.

I bought a used Williams Northeastern caboose and I need to replace the wire to the inside lamp from one of the trucks.  When you unscrew the truck the nut falls off inside.  I can't figure out how to disassemble the body.  It seems it will break when I try to pry the sides away from the bottom. Anyone know how?