Sentence:  Marcus Wong, a self-described <WSD>gunzel</WSD> (rail obsessive) and engineering geek, conducted his experiment in two stages – timing the hybrid Metcard/myki barriers in June and again last week with the new myki-only gates that have replaced them. 
Meaning of the word marked with <WSD> tags:  A railway or tram enthusiast; "particularly"  one who is overly enthusiastic or foolish.