Cast (not sheet; different animal) brass, even bronze, was once the standard in domestic model railroading for running gear, and even bodies and boilers. They are permanent and very heavy. Easier to work, especially the brass. Probably more expensive than zinc, hence the zinc. Zinc is fine so long as it is not contaminated. Our stuff costs so much anyway, maybe the cost of brass castings would not be a big addition to the bottom line. Don't know. It'll never happen anyway.
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