The Lionel 812 was in poor condition when it arrived. The tin plate was corroded on many places. In one place the corroded tin-plate contacted the brass plate directly and made it turn dark brown (second plate from the left on the photo). Although I do not understand the chemistry completely, but then the exact composition of the tin-plate and the brass are also unknown, it is clear that the brass was affected quiet strongly. I tried to clean this dark-brown brass with a household brass cleaner, metal polish, washing and basically it did not work. Only carefull light sanding did the trick and got the brass back in original luster. I am still sanding and polishing, but it alreday looks much better.
The photo's on the left show the plates when I started cleaning and on the right how they are now.
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