Just a quess, try removing the fuel tank, and see if there are 4 screws. And you might have to remove the couplers, and also look closely at the trucks, moving them side to side, and see if any screws are there.
Mike.
My You Tube
I have a new Bachman E-7, and I cannot readily see how to get the shell off. It appears I do not have to remove the couplers. The exploded diagram isn't much help. Before I remove a bunch of screws un neccessarily I thought someone might be able to shed some light on removing the shell. Thanks in advance.