From Longman Dictionary of Contemporary Englishbird/train etc spotterbird/train etc spotterBritish EnglishDLO someone who spends time watching birds, trains etc for pleasure and writes down the things that they see → spotter
Examples from the Corpus
bird/train etc spotter• I suppose we're all train spotters at heart.• It's a bonus for the late train spotter.• In Leicester a group of men got up like train spotters were very excited to see our coach.• Why are so many train spotters called Derek?• What a field day the train spotters had!• Here is the story of one of them, Derek, the most unsuccessful train spotter in the world. 