QUOTE: Originally posted by JimdeBree Bigboy--I don't think you have to remove the coupler boxes on a Kato AC4400(like you do on an Athearn RTR AC4400). The trick with the Kato AC 4400 is getting the shell back on. The problem is the wires used to power the lamps tend to slip out of their holders and get in the way of the shell. Carefully tuck them into their proper places before reattaching the shell.