@Mike CT posted:Gargraves track has a stainless steel option, but it only applies to the two outside rails. Center rail is still plated galvanize with a black coating. ??I think?? Edit Add: stainless steel does not solder well, You may have to use some type of mechanical wire connection.
Outside use, there is a consideration of the effect of ultraviolet light on the plastic ties.
202 O-Gauge 3-Rail with Stainless Steel rails
The GG stainless track that I have seen (a friend used it a few years ago) is all stainless, all 3 rails, none blackened; wouldn't make sense otherwise.