Sentence:  I ask him about Australian trainspotters. 'Do such people exist?' / 'We call them train <WSD>gunzels</WSD>. A <WSD>gunzel</WSD> is a person who is really stuck on one thing. In Sydney you get guys on the platforms. This carriage here is the CDF924 – that's the number for Matilda's Restaurant. The guys on the platform will say, "Oh, I haven't seen that for a while"nb...' 
Meaning of the word marked with <WSD> tags:  An enthusiast or geek with a specific interest.