ferroequinologist

Etymology
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Noun

 * 1)  A student of ferroequinology; a person who studies trains as a hobby.
 * 2) * 1954, Trains, Kalmbach Pub. Co.
 * And because you care, you’ve automatically classified yourself as a railfan (alias railroad enthusiast, train-watcher, ferroequinologist).

Synonyms

 * railfan