I have some new, Lionel Passenger cars from the MPC era. These are Southern Crescent cars with numbers from 6-9530 to 6-9534. I would like to access the interiors in order to inspect the possibility of changing the lights to led's. I don't see any way, short of prying the roofs off to gain access to the interior. I tried to pry one off, but it only comes a bit free on the ends and not in the middle. I am wondering if there is a trick to open these up that anyone has discovered. there are no visible screws that indicate how these were assembled. I think they may have been glued together. I think these were manufactured somewhere around 1978 in Michigan.
Any ideas?