Long-distance-train passengers tend to belong to one of four categories. The first, perhaps most obvious category is occupied by people who refuse to fly, whether because of religious beliefs, fear or health reasons, but there are fewer of these than you might expect. The second category belongs to train buffs, known less commonly as rail fans, GERFs (glassy-eyed rail fans), or foamers, a term coined by railroad employees to refer to people who became so excited by trains that they seem to foam at the mouth like rabies victims.
via www.nytimes.com
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