ThE ** RAREST** C.O.P.O. Car .

[Z-11 396]

I've heard the word C.O.P.O. for a long time, but have always wondered which one of the car's is the Rarest C.O.P.O.-- Do any of you have a idea, or thought about which one it is ? How it would be picked, would it be based on the fewest cars built, the number of engines,built or the size or type of engine , or how many of C.O.P.O.s it has. >>>>>>>>>>>>