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A railroad fan who cannot control himself. Train equivalent of a Gooner. Usually obsessed with one train in particular. Would literally jerk off to trains. The problem with foamers is they ruin it for the rest of us railfans, by being fucking retards. The typical habit of the common foamer is: stand infront of trains to get a good photo, pissing off the driver in the process, then drool over a common ass train. However, don't confuse foamers with people who have just seen a train for the first time...
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