I actually have the Railroading badge; since I was at scout camp and locomotives were in short supply, I learned various train parts using models. It was really pretty interesting. Did you know that train cabooses aren't used anymore because they were replaced by a FRED? (Flashing Rear End Device)
My university sells these in the student store; I myself am the proud owner of a fat cell. I got it mostly so I could throw it at people and yell, "YOU GOT FAT!"