Regarding the oh-so-heavy 3rd Rail cars. Other than the ends, what else on these cars, excluding the shells, makes them so heavy?
If they were mine, I'd look at using an end, or ends if they are different, to make a mold and cast them in resin. Ditto for any other fishing sinker components.
Alternatively, create 3D CAD models, print them and offer them for sale to the rest of the community.
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