In Vienna’s Museumsquartier, a group of ‘hackers’ put together then displayed, an operational Turing Machine built using a model railroad. Its called the Turing Train Terminal, and it looks extremely cool. I would have loved to have seen this in operation. The site has a bit more info, not enough for my liking, but the PDF goes into more detail on the actual operation. See, you knew model railroads were cool, now you can tell your wife/GF your building a computational device in the garage!