You will need to remove the sheet metal frame from the aluminum shell after removing the trucks.
That will expose the base that is suspended at each end by a hanger base. You can slide the hanger bases and base out of the shorter end of the shell to repair.
You may also choose to carefully remove the vista dome to provide access to the dome interior upon its reinstallation. Just press against at the center near the channel to free one end at a time. It takes some pressure, but when applied with some upward direction the end will come free. There are no replacement domes available from LIONEL so work carefully.
Included are some photos of the parts involved. Good luck.
Hi Carl - this is very helpful, thank you. I managed to get the body off the frame:
Now am trying to figure out how to get the dome apart. It does not want to slide either direction as there seems to be something glued inside that’s preventing it from moving. When I squeeze the hanger clips together, nothing wants to budge. I don’t want to force it. Any recommendations?
in the second part of your reply, did you mean that I can gain access through the dome itself, here?:
Many thanks for taking the time to help me out.
Kevin