LEGO's train tracks (the actual rail part) were made from some kind of metal alloy that does not seem to oxidize, and seems to have good electrical charateristics (low resistance).
Any ideas what this might be?
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Die Schienenprofile von Modelleisenbahnen [...] bestehen mitunter aus Neusilber [...]
Translated: "the rail profile of model railways [...] sometimes consist of nickel-silver [...]"