train·spot·ter
noun/ˈtreɪnspɒtə(r)/
/ˈtreɪnspɑːtər/
(British English)- 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 - (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