trainspotter

noun
🔊/ˈtreɪnspɒtə(r)/
🔊/ˈtreɪnspɑːtər/
(British English)
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  1. a person who collects the numbers of railway engines as a hobby(作为业余爱好)收集机车号码的人Topics Transport by bus and trainc2
  2. (disapproving) a person who is interested in the details of a subject that other people think are boring过分注重细节的人