train-spotting (n.)youdaoicibaDictYouDict[train-spotting 词源字典]
1959 (train spotter attested from 1958), chiefly British English, in reference to the hobby of recording the numbers of railway locomotives one has observed; from train (n.) in the railroad sense + verbal noun from spot (v.).[train-spotting etymology, train-spotting origin, 英语词源]